Height for boys at 4 years

At 4 years, the median height for boys on the CDC 2000 growth charts is 102.2 cm (40.2 in): half of boys this age measure less and half more. The middle half of boys, from the 25th to the 75th percentile, falls between 99.4 and 105.1 cm, a spread of 5.7 cm. The outer lines of the chart, the 3rd and 97th percentiles, sit at 94.3 and 110.2 cm.

Since 3 years, the median has risen by 7.3 cm over 1 year. By 5 years it reaches 108.9 cm.

For girls at 4 years the median is 100.8 cm, 1.5 cm less than for boys, which is why the charts are drawn separately by sex.

From 2 years CDC recommends its own 2000 growth charts, which draw the 3rd to the 97th percentile; under 2, the WHO charts draw the 2nd to the 98th.

Reading the table: a boy at 4 years who measures 104.0 cm is at about the 66th percentile, meaning that out of 100 boys this age, about 66 measure less. From 2 years this is height measured standing. If a child of 2 or older was measured lying down, CDC subtracts 0.8 cm before comparing.