Height Chart for 20-Month-Old Boys

The WHO median length for 20-month-old boys is 84.2 cm (2 ft 9.1 in), measured lying down. The 3rd percentile is 78.9 cm and the 97th is 89.5 cm.

WHO recumbent length percentiles for 20-month-old boys. Source: WHO Child Growth Standards (2006): boys length-for-age, birth to 2 years, file who_boys_months.xlsx, row Month=20 (dataset page).
PercentileMetricFeet-inches
3rd78.9 cm2 ft 7.1 in
5th79.6 cm2 ft 7.3 in
10th80.6 cm2 ft 7.7 in
25th82.3 cm2 ft 8.4 in
50th84.2 cm2 ft 9.1 in
75th86.1 cm2 ft 9.9 in
90th87.8 cm2 ft 10.6 in
95th88.8 cm2 ft 11.0 in
97th89.5 cm2 ft 11.2 in

Check a length against this row

or

Accepts 72.9 to 95.5 cm.

3rd5th10th25th50th75th90th95th97th 78.979.680.682.384.286.187.888.889.5

Length gains before the second birthday

The median adds 0.9 cm in the next month and 3.6 cm by 24 months, where it reaches 87.8 cm. Over the previous six months it rose 6.2 cm.

Monthly gains in the median shrink through the first two years: 4.8 cm in the first month after birth, 1.2 cm between 11 and 12 months, and 0.9 cm between 20 and 21 months.

At 24 months this site switches to the CDC table, which measures standing height; values from the two tables are not compared on these pages.

Nearby rows of the WHO monthly length-for-age table for boys, in centimeters. The last column is the change in the median since the row above.
Age3rd50th97thChange
birth46.349.953.4
14 months73.478.082.7+28.1
16 months75.480.285.1+2.2
18 months77.282.387.3+2.1
19 months78.183.288.4+0.9
20 months78.984.289.5+1.0
21 months79.785.190.5+0.9
22 months80.586.091.6+0.9
24 months82.187.893.6+1.8

Spread at 20 months

The 3rd-to-97th range is 10.6 cm at this age. In the WHO table it widens month by month, from 7.1 cm at birth to 11.5 cm at 24 months.

A 20-month-old boy at the 3rd percentile (78.9 cm) has the median length of a boy at 15 months (79.1 cm); at the 97th percentile (89.5 cm) the length is above the median at 24 months (87.8 cm).

Boys and girls at 20 months

The WHO girls' median at 20 months is 82.7 cm, 1.5 cm shorter than the boys'.

When to ask a pediatrician

A pediatrician reads the line over repeated measurements rather than one value, and crossing downward through percentile lines is the pattern the site's guides flag. If a toddler's growth worries you, speak to a pediatrician or family doctor.

Reference values only, not medical advice. How these tables are built.