2 month old head circumference
On the WHO growth standard, the average (median) head circumference of a 2-month-old baby boy is 39.1 cm (15.4 in) and of a girl 38.3 cm (15.1 in). The usual range, from the 3rd to the 97th percentile, is 36.9–41.3 cm for boys and 36.0–40.5 cm for girls.
Head circumference percentiles at 2 months (WHO)
The median (50th percentile) is the average head size for this age.
| 3rd | 15th | Median | 85th | 97th | |
|---|---|---|---|---|---|
| Boys (cm) | 36.9 | 37.9 | 39.1 | 40.3 | 41.3 |
| Boys (in) | 14.5 | 14.9 | 15.4 | 15.9 | 16.3 |
| Girls (cm) | 36.0 | 37.0 | 38.3 | 39.5 | 40.5 |
| Girls (in) | 14.2 | 14.6 | 15.1 | 15.6 | 16.0 |
Check your baby’s head circumference percentile
Enter the exact date of birth for a precise result, or use the centimetre table below.
Enter a date of birth and at least one measurement to see the percentile.
What percentile is my 2 month old’s head circumference?
WHO percentile for each head circumference, in half centimetres, at exactly 2 months. A few days older or younger shifts it slightly.
| Head | Boy | Girl |
|---|---|---|
| 35.5 cm (14.0 in) | below 1st | 1st |
| 36.0 cm (14.2 in) | below 1st | 3rd |
| 36.5 cm (14.4 in) | 1st | 7th |
| 37.0 cm (14.6 in) | 3rd | 15th |
| 37.5 cm (14.8 in) | 8th | 27th |
| 38.0 cm (15.0 in) | 17th | 42nd |
| 38.5 cm (15.2 in) | 30th | 58th |
| 39.0 cm (15.4 in) | 46th | 73rd |
| 39.5 cm (15.6 in) | 62nd | 85th |
| 40.0 cm (15.7 in) | 77th | 93rd |
| 40.5 cm (15.9 in) | 88th | 97th |
| 41.0 cm (16.1 in) | 94th | 99th |
| 41.5 cm (16.3 in) | 98th | above 99th |
Common questions
What is the average head circumference of a 2-month-old baby?
On the WHO growth standard, the average (median) head circumference of a 2-month-old baby boy is 39.1 cm (15.4 in) and of a girl 38.3 cm (15.1 in). The usual range, from the 3rd to the 97th percentile, is 36.9–41.3 cm for boys and 36.0–40.5 cm for girls.
What percentile is a 39 cm head circumference at 2 months?
On the WHO chart, 39 cm (15.4 in) at exactly 2 months is about the 46th percentile for a boy and the 73rd percentile for a girl. The table on this page gives the percentile for every half centimetre in the usual range.
How much does head circumference grow around 2 months?
Going by the WHO medians, about 1.9 cm for boys and 1.7 cm for girls in the month leading up to 2 months. Head growth is fastest in the first months and slows during the second year.
Is my 2-month-old's head too big or too small?
A head circumference between the 3rd and the 97th percentile is within the usual range, and head size often runs in families. Pediatricians look most at the trend: talk to yours if the measurement is below the 3rd or above the 97th percentile, or if the curve crosses two of the main percentile lines between visits.
Also: 2 month old baby weight · 2 month old baby length · head circumference chart by month · about head circumference
Source: WHO Child Growth Standards, head circumference-for-age, percentiles computed from the WHO LMS tables at 2 completed months. Measure around the widest part of the head, above the eyebrows and ears. For information only; not medical advice.