Baby Boy Growth Chart: Height and Weight Birth to 11 Months
Author: Ian C. Langtree - Writer/Editor for Disabled World (DW)
Published: 21 Aug 2023 - Updated: 9 Jun 2026
Publication Type: Conversion, Calculation
Contents: Synopsis - Definition - Introduction - Main - Insights, Updates - Related Publications
Synopsis: This information provides a detailed reference chart documenting average height and weight measurements for male infants from birth through eleven months of age. The data comes directly from authoritative health organizations including the World Health Organization, the National Institutes of Health's Gerontology Research Center, and the Centers for Disease Control and Prevention, making it a reliable resource for parents, caregivers, and healthcare providers who need to monitor infant development. Parents of children with disabilities or developmental concerns will find this particularly valuable as it establishes baseline growth patterns against which to measure their child's progress. The chart offers specific monthly benchmarks - noting that newborn boys average 7.8 pounds and 19.7 inches at birth, typically doubling their weight by four months and tripling it by their first birthday - which helps identify potential growth issues early when intervention can make the most difference.
At a Glance
- 1 - Most baby boys put on roughly an ounce a day until they are about three months old, a steady early climb that adds up quickly.
- 2 - By 11 months the chart puts the average boy at around 20.8 pounds and 29.3 inches, well over double his birth weight and nearly 10 inches longer than at birth.
- 3 - The figures are compiled from three authoritative bodies - the World Health Organization, the NIH's Gerontology Research Center, and the U.S. Centers for Disease Control and Prevention.
- Topic Definition: Baby Boy Growth Chart
A baby boy growth chart is a reference table that lays out the average height and weight expected for male infants at each stage of their first year, here running from birth through eleven months. Rather than setting a strict standard every child must meet, it gathers averages from large population studies so parents, caregivers, and doctors can see roughly where a baby sits compared to others his age. The real value lies in watching the overall trend, since healthy babies grow along their own individual curves shaped by genetics, feeding, activity, and any underlying health conditions. Used the right way, a chart like this gives a useful starting point for tracking development and, more importantly, for opening a conversation with a pediatrician who can weigh a baby's numbers against his complete health picture before deciding whether anything actually warrants a closer look.
Introduction
In the United States, the average newborn baby boy weighs 7 pounds 8 ounces (3.4 kg) and is 19.7 inches (49.9 cm) in length at birth. Most baby boys will gain about an ounce a day until they are three months old. By four months old, most male babies have doubled their birth weight; by one year, most have tripled it.
Main Content
| Age | Weight | Length |
|---|---|---|
| 0 Months | 7.8 lb. (3.4 kg) | 19.7" (49.9 cm) |
| 1 Month | 9.8 lb. (4.4 kg) | 21.6" (54.8 cm) |
| 2 Months | 12.3 lb. (0.01 t) | 23.0" (58.4 cm) |
| 3 Months | 14.1 lb. (6.4 kg) | 24.2" (61.4 cm) |
| 4 Months | 15.4 lb. (7 kg) | 25.2" (64 cm) |
| 5 Months | 16.6 lb. (7.53 kg) | 26.0" (66 cm) |
| 6 Months | 17.5 lb. (7.94 kg) | 26.6" (67.5 cm) |
| 7 Months | 18.3 lb. (8.3 kg) | 27.2" (69 cm) |
| 8 Months | 19.0 lb. (8.62 kg) | 27.8" (70.6 cm) |
| 9 Months | 19.6 lb. (8.9 kg) | 28.3" (71.8 cm) |
| 10 Months | 20.1 lb. (9.12 kg) | 28.8" (73.1 cm) |
| 11 Months | 20.8 lb. (9.43 kg) | 29.3" (74.4 cm) |
Printable Height to Weight Chart for Male Babies From Birth to 11 Months of Age
Other Printable Height to Weight Reference Charts:
*Information and data for above growth charts sourced from The World Health Organization (WHO), Gerontology Research Center (National Institutes of Health (NIH), USA), and the U.S. Centers for Disease Control and Prevention (CDC).
Insights, Analysis, and Developments
Editorial Note: While these measurements represent population averages drawn from major health agencies, every child follows their own unique growth trajectory. What matters most isn't matching these numbers exactly, but rather seeing consistent progress over time along your baby's personal growth curve. Parents should remember that factors including genetics, feeding method, activity level, and underlying health conditions all influence an infant's size. Children with certain disabilities or medical conditions may follow different growth patterns entirely, yet still thrive. Use this chart as a helpful reference point rather than a rigid standard, and always discuss any concerns about your baby's growth with a pediatrician who knows your child's complete health picture and can interpret these numbers within the proper context.
Author Credentials: Ian is the founder and Editor-in-Chief of Disabled World, a leading resource for news and information on disability issues. With a global perspective shaped by years of travel and lived experience, Ian is a committed proponent of the Social Model of Disability-a transformative framework developed by disabled activists in the 1970s that emphasizes dismantling societal barriers rather than focusing solely on individual impairments. His work reflects a deep commitment to disability rights, accessibility, and social inclusion. To learn more about Ian's background, expertise, and accomplishments, visit his full biography.