Girls Head circumference-for-age 0-36 months (5th through 95th percentiles)
5th Percentile
| Age (in months) |
Head Circumference (in centimeters) |
| 0 |
32.2509 |
| 0.5 |
33.68744 |
| 1.5 |
35.7756 |
| 2.5 |
37.26522 |
| 3.5 |
38.40561 |
| 4.5 |
39.31814 |
| 5.5 |
40.07086 |
| 6.5 |
40.70567 |
| 7.5 |
41.25016 |
| 8.5 |
41.7234 |
| 9.5 |
42.13913 |
| 10.5 |
42.50755 |
| 11.5 |
42.83643 |
| 12.5 |
43.13182 |
| 13.5 |
43.39853 |
| 14.5 |
43.64042 |
| 15.5 |
43.86066 |
| 16.5 |
44.06186 |
| 17.5 |
44.2462 |
| 18.5 |
44.41553 |
| 19.5 |
44.57142 |
| 20.5 |
44.71521 |
| 21.5 |
44.84806 |
| 22.5 |
44.97099 |
| 23.5 |
45.08487 |
| 24.5 |
45.19047 |
| 25.5 |
45.2885 |
| 26.5 |
45.37954 |
| 27.5 |
45.46415 |
| 28.5 |
45.5428 |
| 29.5 |
45.61594 |
| 30.5 |
45.68394 |
| 31.5 |
45.74718 |
| 32.5 |
45.80596 |
| 33.5 |
45.86058 |
| 34.5 |
45.9113 |
| 35.5 |
45.95837 |
| 36 |
45.98061 |
10th Percentile
| Age (in months) |
Head Circumference (in centimeters) |
| 0 |
32.75949 |
| 0.5 |
34.17346 |
| 1.5 |
36.23326 |
| 2.5 |
37.70685 |
| 3.5 |
38.83814 |
| 4.5 |
39.74588 |
| 5.5 |
40.49672 |
| 6.5 |
41.13171 |
| 7.5 |
41.67787 |
| 8.5 |
42.15391 |
| 9.5 |
42.5733 |
| 10.5 |
42.94604 |
| 11.5 |
43.27977 |
| 12.5 |
43.58043 |
| 13.5 |
43.85274 |
| 14.5 |
44.1005 |
| 15.5 |
44.32682 |
| 16.5 |
44.53428 |
| 17.5 |
44.72501 |
| 18.5 |
44.90085 |
| 19.5 |
45.06333 |
| 20.5 |
45.21378 |
| 21.5 |
45.35334 |
| 22.5 |
45.48301 |
| 23.5 |
45.60367 |
| 24.5 |
45.71608 |
| 25.5 |
45.82092 |
| 26.5 |
45.91878 |
| 27.5 |
46.01021 |
| 28.5 |
46.09568 |
| 29.5 |
46.17562 |
| 30.5 |
46.25043 |
| 31.5 |
46.32044 |
| 32.5 |
46.38599 |
| 33.5 |
46.44736 |
| 34.5 |
46.50481 |
| 35.5 |
46.55859 |
| 36 |
46.58417 |
25th Percentile
| Age (in months) |
Head Circumference (in centimeters) |
| 0 |
33.65187 |
| 0.5 |
35.02508 |
| 1.5 |
37.03282 |
| 2.5 |
38.47603 |
| 3.5 |
39.58905 |
| 4.5 |
40.48611 |
| 5.5 |
41.23136 |
| 6.5 |
41.86435 |
| 7.5 |
42.41113 |
| 8.5 |
42.88978 |
| 9.5 |
43.31329 |
| 10.5 |
43.69135 |
| 11.5 |
44.03133 |
| 12.5 |
44.33899 |
| 13.5 |
44.61891 |
| 14.5 |
44.87476 |
| 15.5 |
45.10959 |
| 16.5 |
45.32587 |
| 17.5 |
45.5257 |
| 18.5 |
45.71086 |
| 19.5 |
45.88284 |
| 20.5 |
46.04295 |
| 21.5 |
46.19229 |
| 22.5 |
46.33184 |
| 23.5 |
46.46246 |
| 24.5 |
46.58489 |
| 25.5 |
46.6998 |
| 26.5 |
46.80778 |
| 27.5 |
46.90935 |
| 28.5 |
47.00499 |
| 29.5 |
47.09511 |
| 30.5 |
47.18009 |
| 31.5 |
47.2603 |
| 32.5 |
47.33603 |
| 33.5 |
47.40757 |
| 34.5 |
47.47518 |
| 35.5 |
47.53911 |
| 36 |
47.56976 |
50th Percentile
| Age (in months) |
Head Circumference (in centimeters) |
| 0 |
34.71156 |
| 0.5 |
36.03454 |
| 1.5 |
37.97672 |
| 2.5 |
39.38013 |
| 3.5 |
40.46774 |
| 4.5 |
41.34841 |
| 5.5 |
42.08335 |
| 6.5 |
42.71034 |
| 7.5 |
43.25429 |
| 8.5 |
43.7325 |
| 9.5 |
44.15743 |
| 10.5 |
44.53837 |
| 11.5 |
44.88241 |
| 12.5 |
45.19508 |
| 13.5 |
45.48078 |
| 14.5 |
45.74308 |
| 15.5 |
45.98487 |
| 16.5 |
46.20858 |
| 17.5 |
46.41622 |
| 18.5 |
46.6095 |
| 19.5 |
46.78989 |
| 20.5 |
46.95863 |
| 21.5 |
47.11681 |
| 22.5 |
47.26538 |
| 23.5 |
47.40516 |
| 24.5 |
47.53688 |
| 25.5 |
47.66118 |
| 26.5 |
47.77865 |
| 27.5 |
47.88979 |
| 28.5 |
47.99506 |
| 29.5 |
48.09488 |
| 30.5 |
48.18961 |
| 31.5 |
48.2796 |
| 32.5 |
48.36515 |
| 33.5 |
48.44654 |
| 34.5 |
48.52402 |
| 35.5 |
48.59783 |
| 36 |
48.63342 |
75th Percentile
| Age (in months) |
Head Circumference (in centimeters) |
| 0 |
35.85124 |
| 0.5 |
37.11807 |
| 1.5 |
38.98533 |
| 2.5 |
40.34145 |
| 3.5 |
41.39732 |
| 4.5 |
42.25604 |
| 5.5 |
42.97566 |
| 6.5 |
43.59207 |
| 7.5 |
44.12897 |
| 8.5 |
44.60282 |
| 9.5 |
45.0255 |
| 10.5 |
45.40587 |
| 11.5 |
45.75072 |
| 12.5 |
46.06532 |
| 13.5 |
46.3539 |
| 14.5 |
46.61986 |
| 15.5 |
46.86599 |
| 16.5 |
47.0946 |
| 17.5 |
47.30765 |
| 18.5 |
47.50676 |
| 19.5 |
47.69335 |
| 20.5 |
47.86861 |
| 21.5 |
48.0336 |
| 22.5 |
48.18923 |
| 23.5 |
48.33629 |
| 24.5 |
48.47548 |
| 25.5 |
48.60743 |
| 26.5 |
48.7327 |
| 27.5 |
48.85178 |
| 28.5 |
48.9651 |
| 29.5 |
49.07308 |
| 30.5 |
49.17607 |
| 31.5 |
49.2744 |
| 32.5 |
49.36836 |
| 33.5 |
49.45823 |
| 34.5 |
49.54425 |
| 35.5 |
49.62665 |
| 36 |
49.66656 |
90th Percentile
| Age (in months) |
Head Circumference (in centimeters) |
| 0 |
36.9535 |
| 0.5 |
38.16405 |
| 1.5 |
39.95459 |
| 2.5 |
41.26063 |
| 3.5 |
42.28153 |
| 4.5 |
43.11489 |
| 5.5 |
43.81575 |
| 6.5 |
44.41815 |
| 7.5 |
44.94461 |
| 8.5 |
45.41078 |
| 9.5 |
45.82799 |
| 10.5 |
46.20466 |
| 11.5 |
46.54726 |
| 12.5 |
46.86084 |
| 13.5 |
47.14942 |
| 14.5 |
47.41624 |
| 15.5 |
47.66399 |
| 16.5 |
47.89487 |
| 17.5 |
48.11074 |
| 18.5 |
48.31317 |
| 19.5 |
48.50351 |
| 20.5 |
48.6829 |
| 21.5 |
48.85236 |
| 22.5 |
49.01276 |
| 23.5 |
49.16486 |
| 24.5 |
49.30933 |
| 25.5 |
49.44677 |
| 26.5 |
49.57773 |
| 27.5 |
49.70266 |
| 28.5 |
49.822 |
| 29.5 |
49.93613 |
| 30.5 |
50.0454 |
| 31.5 |
50.15012 |
| 32.5 |
50.25058 |
| 33.5 |
50.34704 |
| 34.5 |
50.43974 |
| 35.5 |
50.52889 |
| 36 |
50.5722 |
95th Percentile
| Age (in months) |
Head Circumference (in centimeters) |
| 0 |
37.65138 |
| 0.5 |
38.82535 |
| 1.5 |
40.56517 |
| 2.5 |
41.83732 |
| 3.5 |
42.83396 |
| 4.5 |
43.64924 |
| 5.5 |
44.3363 |
| 6.5 |
44.92803 |
| 7.5 |
45.44619 |
| 8.5 |
45.90591 |
| 9.5 |
46.31815 |
| 10.5 |
46.69106 |
| 11.5 |
47.0309 |
| 12.5 |
47.34255 |
| 13.5 |
47.62991 |
| 14.5 |
47.89613 |
| 15.5 |
48.1438 |
| 16.5 |
48.37505 |
| 17.5 |
48.5917 |
| 18.5 |
48.79526 |
| 19.5 |
48.98703 |
| 20.5 |
49.16814 |
| 21.5 |
49.33955 |
| 22.5 |
49.50211 |
| 23.5 |
49.65657 |
| 24.5 |
49.80358 |
| 25.5 |
49.94373 |
| 26.5 |
50.07751 |
| 27.5 |
50.20541 |
| 28.5 |
50.32783 |
| 29.5 |
50.44514 |
| 30.5 |
50.55769 |
| 31.5 |
50.66578 |
| 32.5 |
50.76968 |
| 33.5 |
50.86965 |
| 34.5 |
50.96593 |
| 35.5 |
51.05872 |
| 36 |
51.10387 |