normal head circumference for 2 year old boy

National Center for Health Statistics. The information on this website is of a general nature and available for educational purposes only and 0000001265 00000 n Data table of Stature-for-age charts It may be seen with chrom Having a grey hair in 2 years old is not normal ,wait and watch if any more grey hair come up .At present just watch .It may happen if there family You can use the Center For Disease Control Growth Charts to check height, weight, BMI & head circumference for childs age and gender. 0000002069 00000 n Tooth eruption may be delayed by familial patterns or by conditions such as rickets Hypophosphatemic Rickets Hypophosphatemic rickets is a genetic disorder characterized by hypophosphatemia, defective intestinal absorption of calcium, and rickets or osteomalacia unresponsive to vitamin D. It is usually read more , hypopituitarism Growth Hormone Deficiency in Children Growth hormone deficiency is the most common pituitary hormone deficiency in children and can be isolated or accompanied by deficiency of other pituitary hormones. B&W Press-Ready [PDF 206 KB] Modified 9/15/05 It will open today at 3:00PM.*. Macrocephaly is a word that means your baby has a larger than normal head circumference. Data table of Weight-for-stature charts, B&W [PDF 40 KB] Modified 10/16/00 For these, please consult a doctor (virtually or in person). This change is fundamentally due to a decrease in extracellular fluid from 45% to 28% of body weight. 23-30.5: 35.5-40.5: 40.5-46: 45.5-51: 51-56: Adult Woman Man; Circumference (in.) 25 0 obj<>stream https://www.healthychildren.org/English/ages-stages/baby/Pages/First-Month-Physical-Appearance-and-Growth.aspxOpens a new window [Accessed April 2022], CDC. The following English-language resources may be useful. Created for people with ongoing healthcare needs but benefits everyone. alone. Disclaimer:This information is just a guide and not a substitute for medical advice from a qualified professional. There will be rapid growth during the first four months. This rare condition can increase the pressure in your baby's head. Spanish Version Color [PDF 52 KB] Modified 10/16/00 NCHS Health E-Stats, 2020. Between age 2 years and puberty, weight increases approximately 2 kg/year. Spanish Version, Color [PDF 54 KB] Modified 10/16/00 Please note that THE MANUAL is not responsible for the content of these resources. Boys' heads (and bodies) are slightly larger, but the difference is less than half an inch (1 cm). From birth until age 2 years, it is recommended that all growth parameters be charted using standard growth charts from the World health Organization (WHO). Head Circumference Chart. HWn%7Whi/\m7 $A'n9V]H/[E/)| This means that getting worried about your babys large head circumference isnt warranted. Color [PDF 77 KB] Modified 11/21/00 What is the average head circumference for a 15 year old? These are the charts that most users in the United States will find useful for the majority of routine clinical assessments. Understanding your baby's growth and development is more than charting numbers, of course. There is a slow rise again until the onset of puberty, when body fat may again fall, especially in boys. When will my baby's head circumference be measured? Average newborn head circumference | BabyCenter Color [PDF 61 KB] Modified 10/16/00 The American Academy of Pediatrics. Data table of Weight-for-age charts, B&W [PDF 54 KB] Modified 10/16/00 Some small-for-gestational-age infants Small-for-Gestational-Age (SGA) Infant Infants whose weight is < the 10th percentile for gestational age are classified as small for gestational age. Data table of BMI-for-age charts, B&W [PDF 31 KB] Modified 10/16/00 Clarification and additional information. Is my child's head size large for his age? - Doctor.ndtv.com The #1 app for tracking pregnancy and baby growth. Calculation Instructions: The clinical growth charts for stature-for-age were modified because the scale for inches was not correctly aligned with the metric scale. Child Growth Chart Calculator: Head Circumference Age WHO 0-5 Year Data table of Head circumference-for-age charts This calculator provides your baby's head circumference percentile based on age. Access ANCHOR, the intranet for Nationwide Childrens employees. For routine viewing on a computer monitor and printing on a laser printer, the individual charts are available as PDF files (Black and White). These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests. Checking that your child fits into this range can reassure you that he is within the normal range of height, weight and head circumference measurements for his age. should not be construed as a substitute for advice from a medical professional or health care provider. The first time your baby's head will be measured is shortly after birth. Females, Birth - 36 Months. https://www.cdc.gov/growthcharts/html_charts/hcageinf.htm. pa-HUY-5PXAr*P T>J,7r There is no scientific evidence, stating the ideal head circumference, but there is an average indication of the head size. B&W Press-Ready [PDF 148 KB] Modified 9/15/05 Color Press-Ready [PDF 236 KB] Modified 9/15/05 Color [PDF 47 KB] Modified 4/20/01 B&W Press-Ready [PDF 207 KB] Modified 9/15/05 French Version, Color [PDF 78 KB] Modified 11/21/00 Boys table- Head circumference for age: Birth to 13 weeks (percentiles) Download: PDF Excel. Color [PDF 48 KB] Modified 10/16/00 Around one month of age, this would go up to 38.1 cm (15 in). 0000008560 00000 n Data table of Length-for-age charts B&W [PDF 408K] If you have a child or care for a child 700 Childrenswas created especially for you. Dr. Karen Dantin answered Family Medicine 39 years experience Depends: She should follow a growth curve based on her birthweight head circumference, weight and length. The numbering system shown is the one most commonly used in the United States. WHO growth charts should be used for preterm infants who are corrected to term age. All clinical growth charts may be viewed, downloaded, and printed in Adobe Acrobat. Our Global Patient Services team is here to help international and out-of-area families every step of the way. Color Press-Ready [PDF 434 KB] Modified 9/15/05 Doctors use charts developed by the World Health Organization (WHO) for babies from birth to 24 months. WHO: Growth charts from the WHO (birth until age 2 years), CDC: Growth charts from the CDC (after age 2 years). Advanced technologies. B&W Press-Ready [PDF 152 KB] Modified 9/15/05 Absorption from the gastrointestinal read more . B&W Press-Ready [PDF 208 KB] Modified 9/15/05 Color Press-Ready [PDF 201 KB] Modified 9/15/05 A child's head circumference reflects the growth of their brain, and is therefore an indicator of the baby's development. When autocomplete results are available use up and down arrows to review and enter to select. Grummer-Strawn LM, Reinold C, Krebs NF, Centers for Disease Control and Prevention (CDC): Use of World Health Organization and CDC growth charts for children aged 059 months in the United States. Color Press-Ready [PDF 200 KB] Modified 9/15/05 endstream endobj 7 0 obj<> endobj 8 0 obj<> endobj 9 0 obj<>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 10 0 obj<> endobj 11 0 obj<> endobj 12 0 obj[/ICCBased 21 0 R] endobj 13 0 obj<>stream 2 years old | Toddler Head chart for boys - LifeMeasure Centers for Disease Control and Prevention. Such occurrences are quite rare and often accompanied by other health issues. Results Head circumference measurements for boys and girls are given in the Table. The prevalence of childhood and adolescent obesity remains high today (1 Weight reference Physical growth includes attainment of full height and appropriate weight and an increase in size of all organs (except lymphatic tissue, which decreases in size). Boys and girls will be measured on different growth charts, as they tend to grow at different patterns and rates. Data table of BMI-for-age charts, B&W [PDF 77 KB] Modified 11/21/00 Sex Date Measured Head Circumference cms inches View Chart Sponsored ad 0 The data showed a strong Pearson correlation between head circumference and height (r=0.583, p=0.000) and an even stronger correlation with age (r=0.815, p=0.000). B&W Press-Ready [PDF 158 KB] Modified 9/15/05 Data table of Weight-for-age charts, B&W [PDF 48 KB] Modified 10/16/00 If you need to go back and make any changes, you can always do so by going to our Privacy Policy page. Each time a measurement is taken, your baby's provider will compare the measurement with your baby's past measurements and with the normal ranges for your child's sex and age. ACOG defines a preterm infant as born at less than 37 weeks gestational age. Color [PDF 418 KB], Download all 10 charts in Set 2 }ZZ$&m.7M. 0000001675 00000 n For boys, see Sexual Differentiation, Adrenarche, and Puberty read more ). *E,e=WE2'M)II Y((i2G6?BA"IWSI7Csffsi9VCI "R0C/Un;r2*Q+ihnX. Normal head circumference for 2 month old, Normal head circumference for 9 month old, Normal head circumference for 12 month old, Normal head circumference for 6 month old. ^MmoG/,TV c-=HkYYy{;}}3\6kz)= . Chart patterns reflect infants breastfed for at least 4 months and still breastfeeding at 12 months. Hello my baby is 2 months old and her weight is 4.6kg and her head circumference is 38.5cm is that normal. French Version, Color [PDF 45 KB] Modified 4/20/01 Color Press-Ready [PDF 339 KB] Modified 9/15/05 Boy's growth chart for two year olds. Macrocephaly: What It Is, Causes, Symptoms & Treatment - Cleveland Clinic Boy's growth standards: birth to 24 months*. 0000040288 00000 n 0000002038 00000 n Growth Charts - WHO Child Growth Standards - CDC In all cases, the data points in the corresponding data file for each modified chart remain unchanged from the initial release on May 30, 2000. xb``d``b Y8 All rights reserved. Eruption of deciduous teeth is similar in both sexes; permanent teeth tend to appear earlier in girls. The World Health Organization. You can measure your baby's head circumference at home, too, if you want. Educational text answers on HealthTap are not intended for individual diagnosis, treatment or prescription. For potential or actual medical emergencies, immediately call 911 or your local emergency service. Macrocephaly is a head circumference greater than two standard deviations above the mean. 700 Childrensfeatures the most current pediatric health care information and research from our pediatric experts physicians and specialists who have seen it all. 0 Data table of Weight-for-age charts, B&W [PDF 67 KB] Modified 10/16/00 Data table of Stature-for-age charts Spanish Version, Color [PDF 63 KB] Modified 11/21/00 2021. https://www.merckmanuals.com/home/children-s-health-issues/growth-and-development/physical-growth-of-infants-and-childrenOpens a new window [Accessed April 2022], Harris SR. 2015. Include Weight, Length, Head Circumference and Weight-for-Length in monthly increments. Height is measured with a standing stadiometer once a child can stand. Spanish Version, Color [PDF 53 KB] Modified 10/16/00 2016. 0000029454 00000 n All individual 2000 CDC growth charts have an initial publication date of May 30, 2000. 0000001678 00000 n 0000012223 00000 n In general, boys weigh more and are taller than girls when growth is complete because boys have a longer prepubertal growth period, increased peak velocity during the pubertal growth spurt, and a longer adolescent growth spurt. The following is a reference chart to estimate the measurements of yournewborn boys head circumferenceright up to the time he turns a year and a half old. Data table of Length-for-age charts By recording these, your babys doctor can assess if your child is developing satisfactorily and if there are any roadblocks. 2001. Otherwise, between 24 and 36 months, length can be used in place of stature. B&W Press-Ready [PDF 153 KB] Modified 9/15/05 Growth Charts for Premature Babies: Following Their Own Curve 0000012762 00000 n Color [PDF 34 KB] Modified 10/16/00 However, all health care providers should consider using the BMI-for-age charts to be consistent with current recommendations. For example out of a sample of 100 babies, a percentile value of 40 percent means your baby weighs . use of this site indicates your agreement to be bound by the Terms of Use. This growth chart for boys gives the measurement range between the 3rd and 97th percentile of the WHO growth standards for baby boys. Graph Plot - Weight versus age graph with 5, 10, 25, 50, 75, 95 and calculated percentile lines. 0000017962 00000 n The doctor will enter this number on your baby's growth chart, along with their length and weight. These summary files contain the clinical charts from either set 1 or set 2 as described above. French Version, Color [PDF 67 KB] Modified 10/16/00 Include Weight, Length and Head Circumference in weekly increments. Otherwise, these same charts can be routed to a black-and-white printer, and will print in black-and-white. Pediatric endocrinologists and others who assess the growth of children with special health care requirements may wish to use the format in set 2 for selected applications. Intracellular fluid stays relatively constant. At age 24 months and older, if children can stand unassisted and follow directions, stature should be measured and plotted on the stature-for-age chart for children (2 to 20 years). Color Press-Ready [PDF 334 KB] Modified 9/15/05 After puberty, the percentage generally stays stable in girls, whereas in boys there tends to be a slight decline. Infant Growth Chart: How to Read Your Baby's Percentiles https://medlineplus.gov/ency/article/002379.htmOpens a new window [Accessed April 2022], Nemours. Read This Next {5l[L{0r#X3=X #y,V9Lt|%(i>jJcgD+Z)|%,m3\q*p+5y4uuE-@uIEiz-Ygg6V`mLj\Pi$ Weight follows a similar pattern. The fontanel, a soft region on the babys head, will close as your child turns 18 months of age. Plotting growth on multiple points over time is also important. Connect with a U.S. board-certified doctor by text or video anytime, anywhere. The average newborn head circumference is about 13.5 inches. Its important to remember there are generally no good or bad individual percentiles. Spanish Version, Color [PDF 51 KB] Modified 10/16/00 Higher resolution PDF files (Color) are available to provide the highest resolution and are intended to be used as a high quality print master for quantity production when using the services of a commercial printing facility. Color Press-Ready [PDF 499 KB] Modified 9/15/05 B&W Press-Ready [PDF 206 KB] Modified 9/15/05 xref For various reasons, modifications were made to charts after the initial publication date. What is the average head circumference for a 6 year old girl? Brought to you by Merck & Co, Inc., Rahway, NJ, USA (known as MSD outside the US and Canada) dedicated to using leading-edge science to save and improve lives around the world. Head circumference reflects brain size and is routinely measured up to 36 months. Set 2 has the outer limits of the curves at the 3rd and 97th percentiles for selected applications. By using our website, you consent to our use of cookies. Enter search terms to find related medical topics, multimedia and more. Previously, any infant weighing < 2.5 kg was termed read more ). your doctor. Spanish Version, Color [PDF 50 KB] Modified 4/20/01 Charts should be printed as two-sided copies, in the following combinations for each sex: B&W [PDF 41 KB] Modified 4/20/01 1. If their number falls in the 30th percentile on the chart, it means that 30 percent of babies the same age have a smaller head circumference, and 70 percent have a larger head circumference. Learn more about the Merck Manuals and our commitment to Global Medical Knowledge. French Version, Color [PDF 64 KB] Modified 10/16/00 Color Press-Ready [PDF 323 KB] Modified 9/15/05 A value below 50 percent means a child's head circumference is less than the average. It is difficult to assess growth with only a few measurements in a short period of time. But most babies dislike getting their head circumference measured and might become fussy, making it difficult for a doctor to get an accurate measurement in one attempt. The measurement obtained will then be measured against a growth chart. What is Normal Baby Head Circumference? Supernumerary teeth and congenital absence of teeth are probably normal variants. Percentile >=2 and <98: Normal head circumference. Please confirm that you are a health care professional. Color Press-Ready [PDF 390 KB] Modified 9/15/05 Please note, we cannot prescribe controlled substances, diet pills, antipsychotics, or other abusable medications. When should I be concerned about my baby's head circumference? These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests. %PDF-1.4 % You will be subject to the destination website's privacy policy when you follow the link. If you would like to schedule an appointment with one of our nationally ranked specialists or Primary Care physicians please click or call (800) 881-7385. 0000043411 00000 n A single "normal" head circumference, that is one . Should be used in conjunction with term charts after 40 weeks. Boys' heads (and bodies) are slightly larger, but the difference is less than half an inch (1 cm). B1'CF7E;/ MpiD1#_I@]g0 0000016171 00000 n Use for phrases The link you have selected will take you to a third-party website. She's passionate about bringing up-to-date, useful information to parents so they can make good decisions for their families. 0000042957 00000 n The percentile tells you what percentage of babies weigh less than your baby. Most boys reach half their adult height by about age 2 years; most girls reach half their adult height at about age 19 months. For example, if your babys measurement is found to be in the 30th percentile, what it means is that of 100 babies, 30 have a smaller circumference. HealthTap uses cookies to enhance your site experience and for analytics and advertising purposes. 0000011479 00000 n Spanish Version, Color [PDF 62 KB] Modified 11/21/00 Color [PDF 40 KB] Modified 4/20/01 Average Head Size For Male And Female - WORLDZFEED National Health Statistics Reports; no 158, 2021. Data table of Weight-for-length charts, B&W [PDF 40 KB] Modified 4/20/01 0000000696 00000 n We believe you should always know the source of the information you're seeing. B&W Press-Ready [PDF 186 KB] Modified 9/15/05 Rate of increase of head circumference with age: 0 to 3 months: 2 cm. Color [PDF 423 KB]. Complications include perinatal asphyxia, meconium aspiration, polycythemia read more tend to be shorter throughout life than infants whose size is appropriate for their gestational age. Stierman B, Afful J, Carroll MD, et al: National Health and Nutrition Examination Survey 2017March 2020 Prepandemic Data FilesDevelopment of Files and Prevalence Estimates for Selected Health Outcomes. In addition, various other factors such as the age up to which the child is breastfed, educational qualifications of the parents, and the environment they grew up also have an impact on the IQ level of the children. Data table of Length-for-age charts All rights reserved. At birth, your baby's head is 25 percent of its future adult size, and by age 3, the brain is 80 percent of its adult size. 0000001268 00000 n Growth charts are standards to identify how children should grow over time. Proportion of fat increases rapidly from 13% at birth to 20 to 25% by 12 months, accounting for the chubby appearance of most infants. Side 1: Length for age + Weight-for-age Side 2: Head circumference-for-age + Weight-for-length Children and adolescents, 2 to 20 years: Side 1: Stature-for-age + Weight-for-length Side 2: BMI-for-age or Weight-for-stature (age 2 to 5 years only) Set 1: Clinical charts with 5th and 95th percentiles Birth to 36 months (5th-95th percentile) %PDF-1.4 % You will be subject to the destination website's privacy policy when you follow the link. Phase 2 (from about 2 years to the onset of puberty): In this phase, growth occurs in relatively constant annual increments. Data table of Head circumference-for-age charts Spanish Version, Color [PDF 48 KB] Modified 4/20/01 0000000016 00000 n The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website. The WHO Growth Charts Color Press-Ready [PDF 173 KB] Modified 9/15/05 The CDC has released extended BMI-for-age growth charts for boys and girls with a very high BMI value. 52.57205. When plotting a babys growth, it is recommended to use corrected age through 2 years from the original due date. is that normal for her age? Diagnosis is suggested by physical anomalies and read more . 0000043178 00000 n At puberty, a second growth spurt occurs, affecting boys Sexual Differentiation, Adrenarche, and Puberty Male sexual development and hormonal function depend on a complex feedback circuit involving the hypothalamus-pituitary-testes modulated by the central nervous system. The percentile shows how your infant's head circumference compares to other infants. Head circumference increases 3.5 cm over the next 2 years; the brain is 80% of adult size by age 3 years and 90% by age 7 years. Microcephaly. Color [PDF 41 KB] Modified 10/16/00 But this measurement is done only a few days after birth. My daughter was diagnosed with having craniofacial dymorphism. Color Press-Ready [PDF 168 KB] Modified 9/15/05 When routed to a color printer, the clinical charts for boys will print in blue and the clinical charts for girls will print in red. https://www.who.int/toolkits/child-growth-standards/standards, Child Height Predictor - Predict Adult Height, Head Circumference-Age (23-41 Gestational). Get prescriptions or refills through a video chat, if the doctor feels the prescriptions are medically appropriate. 9-12: 14-16: 16-18: 18-20: 20-22 (cm.) Color Press-Ready [PDF 488 KB] Modified 9/15/05 After 12 months, height is mostly genetically . These are the numbers your baby's healthcare provider will use to compare your baby's head circumference to average ranges. Boys chart- Head circumference for age: Birth to 2 years (percentile) Boys chart- Head circumference for age: Birth to 5 years (percentile) Tables. Catch-up growth can occur during this 2 year period. https://www.cdc.gov/zika/pdfs/microcephaly_measuring.pdfOpens a new window [Accessed April 2022], CDC. https://www.cdc.gov/growthcharts/data/set1clinical/cj41l020.pdf. Doctors typically provide answers within 24 hours. First month: Physical appearance and growth. French Version, Color [PDF 44 KB] Modified 4/20/01 Arm circumference-for-age - WHO The relatively larger amount of body water, its high turnover rate, and the comparatively high surface losses (due to a proportionately large surface area) make infants more susceptible to fluid deprivation than older children and adults. My 7 year old height is 48 inches, weight 20.0 kg, and head circumference 53 cm. The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website. 0000000872 00000 n A doctor or physician should be consulted to determine growth status. It is difficult to measure HC exactly but those numbers are well within the normal range. ',-]6mRsr N4*!yvd.bvf Tf@f>Y$fhL/F+tPQ!kPZ,O:G]g^fzP)LA After 12 months, height is mostly genetically determined, and height velocity stays nearly constant until puberty; a childs height relative to peers tends to remain the same. Other causes of a large head size are brain tumors or genetic conditions. o [teenager OR adolescent ], , DO, Nemours/Alfred I. duPont Hospital for Children. Weight, length and head circumference are looked at together for an overall picture. Use this calculator at your own risk. B&W Press-Ready [PDF 208 KB] Modified 9/15/05 When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals. Color [PDF 77 KB] Modified 11/21/00 However, there are different versions available to give the parent and medical professional guidance. Infants grow about 25 cm during the first year, and height at 5 years is about double the birth length. Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. Take a look at the chart given here to estimate the measurements of yourbaby girls head circumferenceright up to the time she turns a year and a half. Every baby should be monitored for growth, and it is important to use the right tool to do so. 5 th percentile is around 38 centimeters. After age 2, growth parameters are charted using growth charts from the Centers for Disease Control and Prevention (CDC) (1 Reference Physical growth includes attainment of full height and appropriate weight and an increase in size of all organs (except lymphatic tissue, which decreases in size). Head Circumference Percentile Calculator Sexual Differentiation, Adrenarche, and Puberty, growth charts from the World health Organization (WHO), growth charts from the Centers for Disease Control and Prevention (CDC), Grummer-Strawn LM, Reinold C, Krebs NF, Centers for Disease Control and Prevention (CDC), Growth charts from the WHO (birth until age 2 years), Growth charts from the CDC (after age 2 years). 0000002072 00000 n French Version, Color [PDF 79 KB] Modified 11/21/00 Data table of Stature-for-age charts There will be a difference in the measurements of boys and girls of the same age, with boys measuring on the higher side. Wondering if there is a relation betweenbabys head circumferenceand intelligence? How Much Should Your Infants Head Grow Each Month? Boys' growth chart: 24 to 36 months - BabyCenter India Select Gender - Choose male for boys and female for girls. A baby born full-term is likely to have a head circumference measuring around 34.9 cm (13 inches) at birth. Enter Head Circumference - distance around the child's head. Your baby's head circumference is one of the first measurements healthcare providers will take of your newborn. Describe how infants should grow under optimal conditions. 0000001145 00000 n {0 -5W](.o/kPX4p 7N+?~]}zz|ckz}tu-D OZ|SgBY@DlqVb@1u^o,g]xN^Ny~x?.L!(7=PDO/@_^oWy=}yy|5oA5 f % )CB}pZ+&VB+fwkjQ70BYNu_-}(nKOk?D(p=1$&2\Nv6r@U@Dl.Ni{&sG3#kpMq$KM=^:D7,>-2Q]L.P>[ [2l6#2i~X @d4J cs0"~PhnU TbrYWAv/dxpQqz3ToC,H,^\XtYoXJJ5`/f>zcf&^k1V0ZqA'xPZnPd^({"1aPjmC/. Your baby's doctor will probably refer you to a pediatric neurologist or neurosurgeon if your baby has microcephaly (the name for a very small head size). French Version, Color [PDF 64 KB] Modified 10/16/00 The mean values are plotted against those reported from earlier United Kingdom studies in the Figure. ference-for-age BOYS 50 52 54 Birth to 5 years (percentiles) 48 46 44 42 40 38 36 34 32 Months Birth 246810 246810 246810 246810 year Age years (completed 3 months years 4 and years) 97th 54 85th 52 50th 50 15th 3rd 32 34 36 38 40 42 44 46 48 246810 years WHO 5 years Child Growth Standards If your baby's head circumference is outside the normal range for their age and sex, their healthcare provider will want to check for problems.

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normal head circumference for 2 year old boy