Girls Head Circumference-for-age Birth- 36 months (3rd through 97th percentiles)
3rd Percentile
Age
(in months) |
Head Circumference (in centimeters) |
0 |
31.9302 |
0.5 |
33.38071 |
1.5 |
35.48627 |
2.5 |
36.9855 |
3.5 |
38.13114 |
4.5 |
39.04619 |
5.5 |
39.7996 |
6.5 |
40.43379 |
7.5 |
40.97672 |
8.5 |
41.44768 |
9.5 |
41.86058 |
10.5 |
42.22575 |
11.5 |
42.55105 |
12.5 |
42.8426 |
13.5 |
43.10526 |
14.5 |
43.34294 |
15.5 |
43.55883 |
16.5 |
43.75558 |
17.5 |
43.93539 |
18.5 |
44.10013 |
19.5 |
44.25137 |
20.5 |
44.39047 |
21.5 |
44.51861 |
22.5 |
44.6368 |
23.5 |
44.74593 |
24.5 |
44.84678 |
25.5 |
44.94005 |
26.5 |
45.02634 |
27.5 |
45.1062 |
28.5 |
45.18011 |
29.5 |
45.24852 |
30.5 |
45.31181 |
31.5 |
45.37035 |
32.5 |
45.42444 |
33.5 |
45.4744 |
34.5 |
45.52047 |
35.5 |
45.56291 |
36 |
45.58284 |
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 |
97th Percentile
Age
(in months) |
Head Circumference (in centimeters) |
0 |
38.1211 |
0.5 |
39.27006 |
1.5 |
40.97482 |
2.5 |
42.22321 |
3.5 |
43.2026 |
4.5 |
44.00486 |
5.5 |
44.68183 |
6.5 |
45.26563 |
7.5 |
45.77751 |
8.5 |
46.23224 |
9.5 |
46.64053 |
10.5 |
47.01035 |
11.5 |
47.3478 |
12.5 |
47.65766 |
13.5 |
47.94373 |
14.5 |
48.20911 |
15.5 |
48.4563 |
16.5 |
48.68741 |
17.5 |
48.90419 |
18.5 |
49.10814 |
19.5 |
49.30052 |
20.5 |
49.48244 |
21.5 |
49.65484 |
22.5 |
49.81854 |
23.5 |
49.97429 |
24.5 |
50.12271 |
25.5 |
50.26437 |
26.5 |
50.39978 |
27.5 |
50.5294 |
28.5 |
50.65362 |
29.5 |
50.77281 |
30.5 |
50.88731 |
31.5 |
50.99741 |
32.5 |
51.10338 |
33.5 |
51.20547 |
34.5 |
51.30392 |
35.5 |
51.39892 |
36 |
51.44519 |