A baby head circumference chart, birth to five years.
The full WHO head circumference tables for girls and boys, every month from birth to five years, in centimeters with inches under each. It’s measured around the widest part of the head, above the eyebrows and ears.
Want to plot your own baby’s head measurement? Try the free percentile calculator. No account needed.
The WHO tables
What is the average head circumference for a baby girl by month?
The WHO median head circumference (50th percentile) for girls is 33.9 cm (13.3 in) at birth, 39.5 cm (15.6 in) at 3 months, 42.2 cm (16.6 in) at 6 months, 44.9 cm (17.7 in) at 12 months and 47.2 cm (18.6 in) at 24 months.
| Age | 3rd | 15th | 50th | 85th | 97th |
|---|---|---|---|---|---|
| Birth | 31.7 cm 12.5 in | 32.7 cm 12.9 in | 33.9 cm 13.3 in | 35.1 cm 13.8 in | 36.1 cm 14.2 in |
| 1 mo | 34.3 cm 13.5 in | 35.3 cm 13.9 in | 36.5 cm 14.4 in | 37.8 cm 14.9 in | 38.8 cm 15.3 in |
| 2 mo | 36.0 cm 14.2 in | 37.0 cm 14.6 in | 38.3 cm 15.1 in | 39.5 cm 15.6 in | 40.5 cm 15.9 in |
| 3 mo | 37.2 cm 14.6 in | 38.2 cm 15.0 in | 39.5 cm 15.6 in | 40.8 cm 16.1 in | 41.9 cm 16.5 in |
| 4 mo | 38.2 cm 15.0 in | 39.3 cm 15.5 in | 40.6 cm 16.0 in | 41.9 cm 16.5 in | 43.0 cm 16.9 in |
| 5 mo | 39.0 cm 15.4 in | 40.1 cm 15.8 in | 41.5 cm 16.3 in | 42.8 cm 16.9 in | 43.9 cm 17.3 in |
| 6 mo | 39.7 cm 15.6 in | 40.8 cm 16.1 in | 42.2 cm 16.6 in | 43.5 cm 17.1 in | 44.6 cm 17.6 in |
| 7 mo | 40.4 cm 15.9 in | 41.5 cm 16.3 in | 42.8 cm 16.9 in | 44.2 cm 17.4 in | 45.3 cm 17.8 in |
| 8 mo | 40.9 cm 16.1 in | 42.0 cm 16.5 in | 43.4 cm 17.1 in | 44.7 cm 17.6 in | 45.9 cm 18.1 in |
| 9 mo | 41.3 cm 16.3 in | 42.4 cm 16.7 in | 43.8 cm 17.2 in | 45.2 cm 17.8 in | 46.3 cm 18.2 in |
| 10 mo | 41.7 cm 16.4 in | 42.8 cm 16.9 in | 44.2 cm 17.4 in | 45.6 cm 18.0 in | 46.8 cm 18.4 in |
| 11 mo | 42.0 cm 16.5 in | 43.2 cm 17.0 in | 44.6 cm 17.6 in | 46.0 cm 18.1 in | 47.1 cm 18.5 in |
| 12 mo | 42.3 cm 16.7 in | 43.5 cm 17.1 in | 44.9 cm 17.7 in | 46.3 cm 18.2 in | 47.5 cm 18.7 in |
| 13 mo | 42.6 cm 16.8 in | 43.8 cm 17.2 in | 45.2 cm 17.8 in | 46.6 cm 18.3 in | 47.7 cm 18.8 in |
| 14 mo | 42.9 cm 16.9 in | 44.0 cm 17.3 in | 45.4 cm 17.9 in | 46.8 cm 18.4 in | 48.0 cm 18.9 in |
| 15 mo | 43.1 cm 17.0 in | 44.2 cm 17.4 in | 45.7 cm 18.0 in | 47.1 cm 18.5 in | 48.2 cm 19.0 in |
| 16 mo | 43.3 cm 17.0 in | 44.4 cm 17.5 in | 45.9 cm 18.1 in | 47.3 cm 18.6 in | 48.5 cm 19.1 in |
| 17 mo | 43.5 cm 17.1 in | 44.6 cm 17.6 in | 46.1 cm 18.1 in | 47.5 cm 18.7 in | 48.7 cm 19.2 in |
| 18 mo | 43.6 cm 17.2 in | 44.8 cm 17.6 in | 46.2 cm 18.2 in | 47.7 cm 18.8 in | 48.8 cm 19.2 in |
| 19 mo | 43.8 cm 17.2 in | 45.0 cm 17.7 in | 46.4 cm 18.3 in | 47.8 cm 18.8 in | 49.0 cm 19.3 in |
| 20 mo | 44.0 cm 17.3 in | 45.1 cm 17.8 in | 46.6 cm 18.3 in | 48.0 cm 18.9 in | 49.2 cm 19.4 in |
| 21 mo | 44.1 cm 17.4 in | 45.3 cm 17.8 in | 46.7 cm 18.4 in | 48.2 cm 19.0 in | 49.4 cm 19.4 in |
| 22 mo | 44.3 cm 17.4 in | 45.4 cm 17.9 in | 46.9 cm 18.5 in | 48.3 cm 19.0 in | 49.5 cm 19.5 in |
| 23 mo | 44.4 cm 17.5 in | 45.6 cm 18.0 in | 47.0 cm 18.5 in | 48.5 cm 19.1 in | 49.7 cm 19.6 in |
| 24 mo | 44.6 cm 17.6 in | 45.7 cm 18.0 in | 47.2 cm 18.6 in | 48.6 cm 19.1 in | 49.8 cm 19.6 in |
| 25 mo | 44.7 cm 17.6 in | 45.9 cm 18.1 in | 47.3 cm 18.6 in | 48.8 cm 19.2 in | 49.9 cm 19.6 in |
| 26 mo | 44.8 cm 17.6 in | 46.0 cm 18.1 in | 47.5 cm 18.7 in | 48.9 cm 19.3 in | 50.1 cm 19.7 in |
| 27 mo | 44.9 cm 17.7 in | 46.1 cm 18.1 in | 47.6 cm 18.7 in | 49.0 cm 19.3 in | 50.2 cm 19.8 in |
| 28 mo | 45.1 cm 17.8 in | 46.3 cm 18.2 in | 47.7 cm 18.8 in | 49.2 cm 19.4 in | 50.3 cm 19.8 in |
| 29 mo | 45.2 cm 17.8 in | 46.4 cm 18.3 in | 47.8 cm 18.8 in | 49.3 cm 19.4 in | 50.5 cm 19.9 in |
| 30 mo | 45.3 cm 17.8 in | 46.5 cm 18.3 in | 47.9 cm 18.9 in | 49.4 cm 19.4 in | 50.6 cm 19.9 in |
| 31 mo | 45.4 cm 17.9 in | 46.6 cm 18.3 in | 48.0 cm 18.9 in | 49.5 cm 19.5 in | 50.7 cm 20.0 in |
| 32 mo | 45.5 cm 17.9 in | 46.7 cm 18.4 in | 48.1 cm 18.9 in | 49.6 cm 19.5 in | 50.8 cm 20.0 in |
| 33 mo | 45.6 cm 18.0 in | 46.8 cm 18.4 in | 48.2 cm 19.0 in | 49.7 cm 19.6 in | 50.9 cm 20.0 in |
| 34 mo | 45.7 cm 18.0 in | 46.9 cm 18.5 in | 48.3 cm 19.0 in | 49.8 cm 19.6 in | 51.0 cm 20.1 in |
| 35 mo | 45.8 cm 18.0 in | 47.0 cm 18.5 in | 48.4 cm 19.1 in | 49.9 cm 19.6 in | 51.1 cm 20.1 in |
| 36 mo | 45.9 cm 18.1 in | 47.0 cm 18.5 in | 48.5 cm 19.1 in | 50.0 cm 19.7 in | 51.2 cm 20.2 in |
| 37 mo | 45.9 cm 18.1 in | 47.1 cm 18.5 in | 48.6 cm 19.1 in | 50.1 cm 19.7 in | 51.3 cm 20.2 in |
| 38 mo | 46.0 cm 18.1 in | 47.2 cm 18.6 in | 48.7 cm 19.2 in | 50.1 cm 19.7 in | 51.3 cm 20.2 in |
| 39 mo | 46.1 cm 18.1 in | 47.3 cm 18.6 in | 48.7 cm 19.2 in | 50.2 cm 19.8 in | 51.4 cm 20.2 in |
| 40 mo | 46.2 cm 18.2 in | 47.4 cm 18.7 in | 48.8 cm 19.2 in | 50.3 cm 19.8 in | 51.5 cm 20.3 in |
| 41 mo | 46.2 cm 18.2 in | 47.4 cm 18.7 in | 48.9 cm 19.3 in | 50.4 cm 19.8 in | 51.6 cm 20.3 in |
| 42 mo | 46.3 cm 18.2 in | 47.5 cm 18.7 in | 49.0 cm 19.3 in | 50.4 cm 19.8 in | 51.6 cm 20.3 in |
| 43 mo | 46.4 cm 18.3 in | 47.6 cm 18.7 in | 49.0 cm 19.3 in | 50.5 cm 19.9 in | 51.7 cm 20.4 in |
| 44 mo | 46.4 cm 18.3 in | 47.6 cm 18.7 in | 49.1 cm 19.3 in | 50.6 cm 19.9 in | 51.8 cm 20.4 in |
| 45 mo | 46.5 cm 18.3 in | 47.7 cm 18.8 in | 49.2 cm 19.4 in | 50.6 cm 19.9 in | 51.8 cm 20.4 in |
| 46 mo | 46.5 cm 18.3 in | 47.7 cm 18.8 in | 49.2 cm 19.4 in | 50.7 cm 20.0 in | 51.9 cm 20.4 in |
| 47 mo | 46.6 cm 18.3 in | 47.8 cm 18.8 in | 49.3 cm 19.4 in | 50.7 cm 20.0 in | 51.9 cm 20.4 in |
| 48 mo | 46.7 cm 18.4 in | 47.9 cm 18.9 in | 49.3 cm 19.4 in | 50.8 cm 20.0 in | 52.0 cm 20.5 in |
| 49 mo | 46.7 cm 18.4 in | 47.9 cm 18.9 in | 49.4 cm 19.4 in | 50.9 cm 20.0 in | 52.1 cm 20.5 in |
| 50 mo | 46.8 cm 18.4 in | 48.0 cm 18.9 in | 49.4 cm 19.4 in | 50.9 cm 20.0 in | 52.1 cm 20.5 in |
| 51 mo | 46.8 cm 18.4 in | 48.0 cm 18.9 in | 49.5 cm 19.5 in | 51.0 cm 20.1 in | 52.2 cm 20.6 in |
| 52 mo | 46.9 cm 18.5 in | 48.1 cm 18.9 in | 49.5 cm 19.5 in | 51.0 cm 20.1 in | 52.2 cm 20.6 in |
| 53 mo | 46.9 cm 18.5 in | 48.1 cm 18.9 in | 49.6 cm 19.5 in | 51.1 cm 20.1 in | 52.3 cm 20.6 in |
| 54 mo | 47.0 cm 18.5 in | 48.2 cm 19.0 in | 49.6 cm 19.5 in | 51.1 cm 20.1 in | 52.3 cm 20.6 in |
| 55 mo | 47.0 cm 18.5 in | 48.2 cm 19.0 in | 49.7 cm 19.6 in | 51.2 cm 20.2 in | 52.4 cm 20.6 in |
| 56 mo | 47.1 cm 18.5 in | 48.3 cm 19.0 in | 49.7 cm 19.6 in | 51.2 cm 20.2 in | 52.4 cm 20.6 in |
| 57 mo | 47.1 cm 18.5 in | 48.3 cm 19.0 in | 49.8 cm 19.6 in | 51.3 cm 20.2 in | 52.5 cm 20.7 in |
| 58 mo | 47.2 cm 18.6 in | 48.4 cm 19.1 in | 49.8 cm 19.6 in | 51.3 cm 20.2 in | 52.5 cm 20.7 in |
| 59 mo | 47.2 cm 18.6 in | 48.4 cm 19.1 in | 49.9 cm 19.6 in | 51.4 cm 20.2 in | 52.6 cm 20.7 in |
| 60 mo | 47.2 cm 18.6 in | 48.4 cm 19.1 in | 49.9 cm 19.6 in | 51.4 cm 20.2 in | 52.6 cm 20.7 in |
Head circumference-for-age, girls, birth to 60 months, in centimeters, with inches under each. Source: WHO Child Growth Standards.
Rather not squint at a table? Log each head measurement in Bundle of Joy and it lands on the WHO chart for you, with the percentile.
What is the average head circumference for a baby boy by month?
The WHO median head circumference (50th percentile) for boys is 34.5 cm (13.6 in) at birth, 40.5 cm (15.9 in) at 3 months, 43.3 cm (17.0 in) at 6 months, 46.1 cm (18.1 in) at 12 months and 48.3 cm (19.0 in) at 24 months.
| Age | 3rd | 15th | 50th | 85th | 97th |
|---|---|---|---|---|---|
| Birth | 32.1 cm 12.6 in | 33.1 cm 13.0 in | 34.5 cm 13.6 in | 35.8 cm 14.1 in | 36.9 cm 14.5 in |
| 1 mo | 35.1 cm 13.8 in | 36.1 cm 14.2 in | 37.3 cm 14.7 in | 38.5 cm 15.2 in | 39.5 cm 15.6 in |
| 2 mo | 36.9 cm 14.5 in | 37.9 cm 14.9 in | 39.1 cm 15.4 in | 40.3 cm 15.9 in | 41.3 cm 16.3 in |
| 3 mo | 38.3 cm 15.1 in | 39.3 cm 15.5 in | 40.5 cm 15.9 in | 41.7 cm 16.4 in | 42.7 cm 16.8 in |
| 4 mo | 39.4 cm 15.5 in | 40.4 cm 15.9 in | 41.6 cm 16.4 in | 42.9 cm 16.9 in | 43.9 cm 17.3 in |
| 5 mo | 40.3 cm 15.9 in | 41.3 cm 16.3 in | 42.6 cm 16.8 in | 43.8 cm 17.2 in | 44.8 cm 17.6 in |
| 6 mo | 41.0 cm 16.1 in | 42.1 cm 16.6 in | 43.3 cm 17.0 in | 44.6 cm 17.6 in | 45.6 cm 18.0 in |
| 7 mo | 41.7 cm 16.4 in | 42.7 cm 16.8 in | 44.0 cm 17.3 in | 45.3 cm 17.8 in | 46.3 cm 18.2 in |
| 8 mo | 42.2 cm 16.6 in | 43.2 cm 17.0 in | 44.5 cm 17.5 in | 45.8 cm 18.0 in | 46.9 cm 18.5 in |
| 9 mo | 42.6 cm 16.8 in | 43.7 cm 17.2 in | 45.0 cm 17.7 in | 46.3 cm 18.2 in | 47.4 cm 18.7 in |
| 10 mo | 43.0 cm 16.9 in | 44.1 cm 17.4 in | 45.4 cm 17.9 in | 46.7 cm 18.4 in | 47.8 cm 18.8 in |
| 11 mo | 43.4 cm 17.1 in | 44.4 cm 17.5 in | 45.8 cm 18.0 in | 47.1 cm 18.5 in | 48.2 cm 19.0 in |
| 12 mo | 43.6 cm 17.2 in | 44.7 cm 17.6 in | 46.1 cm 18.1 in | 47.4 cm 18.7 in | 48.5 cm 19.1 in |
| 13 mo | 43.9 cm 17.3 in | 45.0 cm 17.7 in | 46.3 cm 18.2 in | 47.7 cm 18.8 in | 48.8 cm 19.2 in |
| 14 mo | 44.1 cm 17.4 in | 45.2 cm 17.8 in | 46.6 cm 18.3 in | 47.9 cm 18.9 in | 49.0 cm 19.3 in |
| 15 mo | 44.3 cm 17.4 in | 45.5 cm 17.9 in | 46.8 cm 18.4 in | 48.2 cm 19.0 in | 49.3 cm 19.4 in |
| 16 mo | 44.5 cm 17.5 in | 45.6 cm 18.0 in | 47.0 cm 18.5 in | 48.4 cm 19.1 in | 49.5 cm 19.5 in |
| 17 mo | 44.7 cm 17.6 in | 45.8 cm 18.0 in | 47.2 cm 18.6 in | 48.6 cm 19.1 in | 49.7 cm 19.6 in |
| 18 mo | 44.9 cm 17.7 in | 46.0 cm 18.1 in | 47.4 cm 18.7 in | 48.7 cm 19.2 in | 49.9 cm 19.6 in |
| 19 mo | 45.0 cm 17.7 in | 46.2 cm 18.2 in | 47.5 cm 18.7 in | 48.9 cm 19.3 in | 50.0 cm 19.7 in |
| 20 mo | 45.2 cm 17.8 in | 46.3 cm 18.2 in | 47.7 cm 18.8 in | 49.1 cm 19.3 in | 50.2 cm 19.8 in |
| 21 mo | 45.3 cm 17.8 in | 46.4 cm 18.3 in | 47.8 cm 18.8 in | 49.2 cm 19.4 in | 50.4 cm 19.8 in |
| 22 mo | 45.4 cm 17.9 in | 46.6 cm 18.3 in | 48.0 cm 18.9 in | 49.4 cm 19.4 in | 50.5 cm 19.9 in |
| 23 mo | 45.6 cm 18.0 in | 46.7 cm 18.4 in | 48.1 cm 18.9 in | 49.5 cm 19.5 in | 50.7 cm 20.0 in |
| 24 mo | 45.7 cm 18.0 in | 46.8 cm 18.4 in | 48.3 cm 19.0 in | 49.7 cm 19.6 in | 50.8 cm 20.0 in |
| 25 mo | 45.8 cm 18.0 in | 47.0 cm 18.5 in | 48.4 cm 19.1 in | 49.8 cm 19.6 in | 50.9 cm 20.0 in |
| 26 mo | 45.9 cm 18.1 in | 47.1 cm 18.5 in | 48.5 cm 19.1 in | 49.9 cm 19.6 in | 51.1 cm 20.1 in |
| 27 mo | 46.0 cm 18.1 in | 47.2 cm 18.6 in | 48.6 cm 19.1 in | 50.0 cm 19.7 in | 51.2 cm 20.2 in |
| 28 mo | 46.1 cm 18.1 in | 47.3 cm 18.6 in | 48.7 cm 19.2 in | 50.2 cm 19.8 in | 51.3 cm 20.2 in |
| 29 mo | 46.2 cm 18.2 in | 47.4 cm 18.7 in | 48.8 cm 19.2 in | 50.3 cm 19.8 in | 51.4 cm 20.2 in |
| 30 mo | 46.3 cm 18.2 in | 47.5 cm 18.7 in | 48.9 cm 19.3 in | 50.4 cm 19.8 in | 51.6 cm 20.3 in |
| 31 mo | 46.4 cm 18.3 in | 47.6 cm 18.7 in | 49.0 cm 19.3 in | 50.5 cm 19.9 in | 51.7 cm 20.4 in |
| 32 mo | 46.5 cm 18.3 in | 47.7 cm 18.8 in | 49.1 cm 19.3 in | 50.6 cm 19.9 in | 51.8 cm 20.4 in |
| 33 mo | 46.6 cm 18.3 in | 47.8 cm 18.8 in | 49.2 cm 19.4 in | 50.7 cm 20.0 in | 51.9 cm 20.4 in |
| 34 mo | 46.6 cm 18.3 in | 47.8 cm 18.8 in | 49.3 cm 19.4 in | 50.8 cm 20.0 in | 52.0 cm 20.5 in |
| 35 mo | 46.7 cm 18.4 in | 47.9 cm 18.9 in | 49.4 cm 19.4 in | 50.8 cm 20.0 in | 52.0 cm 20.5 in |
| 36 mo | 46.8 cm 18.4 in | 48.0 cm 18.9 in | 49.5 cm 19.5 in | 50.9 cm 20.0 in | 52.1 cm 20.5 in |
| 37 mo | 46.9 cm 18.5 in | 48.1 cm 18.9 in | 49.5 cm 19.5 in | 51.0 cm 20.1 in | 52.2 cm 20.6 in |
| 38 mo | 46.9 cm 18.5 in | 48.1 cm 18.9 in | 49.6 cm 19.5 in | 51.1 cm 20.1 in | 52.3 cm 20.6 in |
| 39 mo | 47.0 cm 18.5 in | 48.2 cm 19.0 in | 49.7 cm 19.6 in | 51.2 cm 20.2 in | 52.4 cm 20.6 in |
| 40 mo | 47.0 cm 18.5 in | 48.3 cm 19.0 in | 49.7 cm 19.6 in | 51.2 cm 20.2 in | 52.4 cm 20.6 in |
| 41 mo | 47.1 cm 18.5 in | 48.3 cm 19.0 in | 49.8 cm 19.6 in | 51.3 cm 20.2 in | 52.5 cm 20.7 in |
| 42 mo | 47.2 cm 18.6 in | 48.4 cm 19.1 in | 49.9 cm 19.6 in | 51.4 cm 20.2 in | 52.6 cm 20.7 in |
| 43 mo | 47.2 cm 18.6 in | 48.4 cm 19.1 in | 49.9 cm 19.6 in | 51.4 cm 20.2 in | 52.7 cm 20.7 in |
| 44 mo | 47.3 cm 18.6 in | 48.5 cm 19.1 in | 50.0 cm 19.7 in | 51.5 cm 20.3 in | 52.7 cm 20.7 in |
| 45 mo | 47.3 cm 18.6 in | 48.5 cm 19.1 in | 50.1 cm 19.7 in | 51.6 cm 20.3 in | 52.8 cm 20.8 in |
| 46 mo | 47.4 cm 18.7 in | 48.6 cm 19.1 in | 50.1 cm 19.7 in | 51.6 cm 20.3 in | 52.8 cm 20.8 in |
| 47 mo | 47.4 cm 18.7 in | 48.6 cm 19.1 in | 50.2 cm 19.8 in | 51.7 cm 20.4 in | 52.9 cm 20.8 in |
| 48 mo | 47.5 cm 18.7 in | 48.7 cm 19.2 in | 50.2 cm 19.8 in | 51.7 cm 20.4 in | 53.0 cm 20.9 in |
| 49 mo | 47.5 cm 18.7 in | 48.7 cm 19.2 in | 50.3 cm 19.8 in | 51.8 cm 20.4 in | 53.0 cm 20.9 in |
| 50 mo | 47.5 cm 18.7 in | 48.8 cm 19.2 in | 50.3 cm 19.8 in | 51.8 cm 20.4 in | 53.1 cm 20.9 in |
| 51 mo | 47.6 cm 18.7 in | 48.8 cm 19.2 in | 50.4 cm 19.8 in | 51.9 cm 20.4 in | 53.1 cm 20.9 in |
| 52 mo | 47.6 cm 18.7 in | 48.9 cm 19.3 in | 50.4 cm 19.8 in | 51.9 cm 20.4 in | 53.2 cm 20.9 in |
| 53 mo | 47.7 cm 18.8 in | 48.9 cm 19.3 in | 50.4 cm 19.8 in | 52.0 cm 20.5 in | 53.2 cm 20.9 in |
| 54 mo | 47.7 cm 18.8 in | 49.0 cm 19.3 in | 50.5 cm 19.9 in | 52.0 cm 20.5 in | 53.3 cm 21.0 in |
| 55 mo | 47.7 cm 18.8 in | 49.0 cm 19.3 in | 50.5 cm 19.9 in | 52.1 cm 20.5 in | 53.3 cm 21.0 in |
| 56 mo | 47.8 cm 18.8 in | 49.0 cm 19.3 in | 50.6 cm 19.9 in | 52.1 cm 20.5 in | 53.4 cm 21.0 in |
| 57 mo | 47.8 cm 18.8 in | 49.1 cm 19.3 in | 50.6 cm 19.9 in | 52.2 cm 20.6 in | 53.4 cm 21.0 in |
| 58 mo | 47.9 cm 18.9 in | 49.1 cm 19.3 in | 50.7 cm 20.0 in | 52.2 cm 20.6 in | 53.5 cm 21.1 in |
| 59 mo | 47.9 cm 18.9 in | 49.2 cm 19.4 in | 50.7 cm 20.0 in | 52.2 cm 20.6 in | 53.5 cm 21.1 in |
| 60 mo | 47.9 cm 18.9 in | 49.2 cm 19.4 in | 50.7 cm 20.0 in | 52.3 cm 20.6 in | 53.5 cm 21.1 in |
Head circumference-for-age, boys, birth to 60 months, in centimeters, with inches under each. Source: WHO Child Growth Standards.
What does a head circumference percentile mean?
Picture a hundred children the same age from the WHO reference, girls with girls and boys with boys. A baby on the 50th percentile for head circumference measures more around the head than half of them and less than the other half. A baby on the 15th is above fifteen of them.
The 50th is the median. That’s usually what people mean by the average for an age. It’s the middle, not a target. If a number worries you, ask your pediatrician. They know the rest of the picture.
There’s also the weight chart and the height chart.
Keep every measurement in one place.
Weight, length and head circumference on the WHO charts, shared with your partner.
