Weight percentiles for boys, birth to 5 years
Month-by-month WHO weight percentiles for boys from birth to 5 years. Pick an age for the full table, what is typical at that age and a calculator.
Percentile calculator
Enter your child's measurement to see the WHO percentile. It uses the same WHO 2006 engine as the Ahozon app, and nothing you type leaves this page.
Values in kg
| Age | P3 | P15 | P50 | P85 | P97 |
|---|---|---|---|---|---|
| Birth | 2.5 | 2.9 | 3.3 | 3.9 | 4.3 |
| 1 month | 3.4 | 3.9 | 4.5 | 5.1 | 5.7 |
| 2 months | 4.4 | 4.9 | 5.6 | 6.3 | 7.0 |
| 3 months | 5.1 | 5.6 | 6.4 | 7.2 | 7.9 |
| 4 months | 5.6 | 6.2 | 7.0 | 7.9 | 8.6 |
| 5 months | 6.1 | 6.7 | 7.5 | 8.4 | 9.2 |
| 6 months | 6.4 | 7.1 | 7.9 | 8.9 | 9.7 |
| 7 months | 6.7 | 7.4 | 8.3 | 9.3 | 10.2 |
| 8 months | 7.0 | 7.7 | 8.6 | 9.6 | 10.5 |
| 9 months | 7.2 | 7.9 | 8.9 | 10.0 | 10.9 |
| 10 months | 7.5 | 8.2 | 9.2 | 10.3 | 11.2 |
| 11 months | 7.7 | 8.4 | 9.4 | 10.5 | 11.5 |
| 12 months | 7.8 | 8.6 | 9.6 | 10.8 | 11.8 |
| 13 months | 8.0 | 8.8 | 9.9 | 11.1 | 12.1 |
| 14 months | 8.2 | 9.0 | 10.1 | 11.3 | 12.4 |
| 15 months | 8.4 | 9.2 | 10.3 | 11.6 | 12.7 |
| 16 months | 8.5 | 9.4 | 10.5 | 11.8 | 12.9 |
| 17 months | 8.7 | 9.6 | 10.7 | 12.0 | 13.2 |
| 18 months | 8.9 | 9.7 | 10.9 | 12.3 | 13.5 |
| 19 months | 9.0 | 9.9 | 11.1 | 12.5 | 13.7 |
| 20 months | 9.2 | 10.1 | 11.3 | 12.7 | 14.0 |
| 21 months | 9.3 | 10.3 | 11.5 | 13.0 | 14.3 |
| 22 months | 9.5 | 10.5 | 11.8 | 13.2 | 14.5 |
| 23 months | 9.7 | 10.6 | 12.0 | 13.4 | 14.8 |
| 24 months | 9.8 | 10.8 | 12.2 | 13.7 | 15.1 |
| 25 months | 10.0 | 11.0 | 12.4 | 13.9 | 15.3 |
| 26 months | 10.1 | 11.1 | 12.5 | 14.1 | 15.6 |
| 27 months | 10.2 | 11.3 | 12.7 | 14.4 | 15.9 |
| 28 months | 10.4 | 11.5 | 12.9 | 14.6 | 16.1 |
| 29 months | 10.5 | 11.6 | 13.1 | 14.8 | 16.4 |
| 30 months | 10.7 | 11.8 | 13.3 | 15.0 | 16.6 |
| 31 months | 10.8 | 11.9 | 13.5 | 15.2 | 16.9 |
| 32 months | 10.9 | 12.1 | 13.7 | 15.5 | 17.1 |
| 33 months | 11.1 | 12.2 | 13.8 | 15.7 | 17.3 |
| 34 months | 11.2 | 12.4 | 14.0 | 15.9 | 17.6 |
| 35 months | 11.3 | 12.5 | 14.2 | 16.1 | 17.8 |
| 36 months | 11.4 | 12.7 | 14.3 | 16.3 | 18.0 |
| 37 months | 11.6 | 12.8 | 14.5 | 16.5 | 18.3 |
| 38 months | 11.7 | 12.9 | 14.7 | 16.7 | 18.5 |
| 39 months | 11.8 | 13.1 | 14.8 | 16.9 | 18.7 |
| 40 months | 11.9 | 13.2 | 15.0 | 17.1 | 19.0 |
| 41 months | 12.1 | 13.4 | 15.2 | 17.3 | 19.2 |
| 42 months | 12.2 | 13.5 | 15.3 | 17.5 | 19.4 |
| 43 months | 12.3 | 13.6 | 15.5 | 17.7 | 19.7 |
| 44 months | 12.4 | 13.8 | 15.7 | 17.9 | 19.9 |
| 45 months | 12.5 | 13.9 | 15.8 | 18.1 | 20.1 |
| 46 months | 12.7 | 14.1 | 16.0 | 18.3 | 20.4 |
| 47 months | 12.8 | 14.2 | 16.2 | 18.5 | 20.6 |
| 48 months | 12.9 | 14.3 | 16.3 | 18.7 | 20.9 |
| 49 months | 13.0 | 14.5 | 16.5 | 18.9 | 21.1 |
| 50 months | 13.1 | 14.6 | 16.7 | 19.1 | 21.3 |
| 51 months | 13.3 | 14.7 | 16.8 | 19.3 | 21.6 |
| 52 months | 13.4 | 14.9 | 17.0 | 19.5 | 21.8 |
| 53 months | 13.5 | 15.0 | 17.2 | 19.7 | 22.1 |
| 54 months | 13.6 | 15.2 | 17.3 | 19.9 | 22.3 |
| 55 months | 13.7 | 15.3 | 17.5 | 20.1 | 22.5 |
| 56 months | 13.8 | 15.4 | 17.7 | 20.3 | 22.8 |
| 57 months | 13.9 | 15.6 | 17.8 | 20.5 | 23.0 |
| 58 months | 14.1 | 15.7 | 18.0 | 20.7 | 23.3 |
| 59 months | 14.2 | 15.8 | 18.2 | 20.9 | 23.5 |
| 60 months | 14.3 | 16.0 | 18.3 | 21.1 | 23.8 |
Source: WHO Child Growth Standards, weight-for-age table. Every value on this page is checked automatically against the published WHO table before publishing, and the calculator uses WHO's LMS method. Updated October 2, 2026. Corrections and questions: ahozon@benbasha.com
What does the percentile mean?
A percentile compares a child with healthy children of the same age and sex from the WHO Multicentre Growth Reference Study. At the 40th percentile, 40 out of 100 children weigh less and 60 weigh more. Anything between the 3rd and 97th percentile is in the normal range. What matters most is that a child keeps following a similar curve over time.
When to ask your pediatrician
Talk to your pediatrician or child health nurse if a measurement is below the 3rd or above the 97th percentile, or if your child's percentile changes a lot between visits, for example crossing two of the main percentile lines. A single measurement says little; the trend over time matters most.
General information, not medical advice. One measurement says little on its own: talk to your pediatrician or child health nurse about your child's growth.