Height Chart for 3-Week-Old Boys
Selected recumbent length percentiles for boys at 3 weeks, reported in centimeters and feet-inches from the cited official reference table.
WHO percentile table
| Percentile | Metric | Feet-inches |
|---|---|---|
| 3rd | 49.8 cm | 1 ft 7.6 in |
| 5th | 50.2 cm | 1 ft 7.8 in |
| 10th | 50.9 cm | 1 ft 8.0 in |
| 25th | 52.1 cm | 1 ft 8.5 in |
| 50th | 53.4 cm | 1 ft 9.0 in |
| 75th | 54.7 cm | 1 ft 9.5 in |
| 90th | 55.9 cm | 1 ft 10.0 in |
| 95th | 56.6 cm | 1 ft 10.3 in |
| 97th | 57.0 cm | 1 ft 10.4 in |
What these numbers imply
The figures below are not published directly by the WHO. Each one is calculated from the official length-for-age and weight-for-age tables so that this page answers questions the raw dataset leaves open. Values differ for every age and sex.
| Measure | Value | How it was derived |
|---|---|---|
| Growth over the next 4 weeks | +3.7 cm | The 50th percentile rises from 53.4 cm to 57.1 cm over the following 4 weeks. Derived from adjacent rows of the same WHO table. |
| Growth since birth | +3.5 cm | The 50th percentile at birth is 49.9 cm; at this age it is 53.4 cm. |
| Spread between 3rd and 97th percentile | 7.2 cm | At this age the middle 94% of boys fall between 49.8 cm and 57.0 cm. |
| Difference from girls at the same age | +0.9 cm | The 50th percentile for boys is 0.9 cm longer than the 50th percentile for girls. |
| Median weight and resulting BMI at this age | 4.1 kg · BMI 14.4 | Combining the 50th percentile of weight (4.1 kg) with the 50th percentile of length (53.4 cm) from the WHO weight-for-age and length-for-age tables. |
These are population reference statistics only. They describe how a group of infants of this age and sex is distributed, and say nothing about any individual child.
How to read this table
For this table, the percentile is a position in the cited reference distribution for children of the same sex and completed age band. The 50th percentile is the median: about half of the reference observations are lower and half are higher. A percentile is not a forecast, target, diagnosis, or measure of an individual child’s health. Measurement method and the reference chart used can change the reported position.
Measurement: WHO reports recumbent length for children under age 2; the page title follows the common height-chart search phrase.
Adjacent ages
Height predictor
This reference table does not embed the calculator. Open the homepage height predictor separately.
Data source
Dataset: WHO Child Growth Standards (2006): boys length-for-age, birth to 13 weeks. All nine displayed values come from who_boys_weeks.xlsx, row Week=3. See the official WHO dataset page.
Reference distribution only. This page does not provide medical advice, a diagnosis, or an individual height forecast.