Data Table of Infant Head Circumference-for-age Charts
Age (in months) | 3rd Percentile Head Circumference (in centimeters) | 5th Percentile Head Circumference (in centimeters) | 10th Percentile Head Circumference (in centimeters) | 25th Percentile Head Circumference (in centimeters) | 50th Percentile Head Circumference (in centimeters) | 75th Percentile Head Circumference (in centimeters) | 90th Percentile Head Circumference (in centimeters) | 95th Percentile Head Circumference (in centimeters) | 97th Percentile Head Circumference (in centimeters) |
---|---|---|---|---|---|---|---|---|---|
0 | 31.48762 | 32.14881 | 33.08389 | 34.46952 | 35.81367 | 37.00426 | 37.97379 | 38.51574 | 38.85417 |
0.5 | 33.25006 | 33.83392 | 34.67253 | 35.93987 | 37.19361 | 38.32125 | 39.24989 | 39.77262 | 40.10028 |
1.5 | 35.78126 | 36.26428 | 36.97377 | 38.07878 | 39.20743 | 40.24987 | 41.12605 | 41.62581 | 41.94138 |
2.5 | 37.5588 | 37.97959 | 38.60724 | 39.60637 | 40.65233 | 41.63968 | 42.48436 | 42.97189 | 43.28181 |
3.5 | 38.89944 | 39.27893 | 39.85123 | 40.77713 | 41.76517 | 42.71455 | 43.53902 | 44.01984 | 44.32733 |
4.5 | 39.95673 | 40.30766 | 40.84114 | 41.71483 | 42.66116 | 43.58358 | 44.39472 | 44.87197 | 45.17877 |
5.5 | 40.81642 | 41.14714 | 41.65291 | 42.48889 | 43.40489 | 44.30801 | 45.11034 | 45.58593 | 45.893 |
6.5 | 41.53109 | 41.84742 | 42.3333 | 43.14204 | 44.0361 | 44.92555 | 45.72225 | 46.19736 | 46.50524 |
7.5 | 42.13521 | 42.44134 | 42.91311 | 43.70245 | 44.58097 | 45.46104 | 46.25443 | 46.72983 | 47.0388 |
8.5 | 42.65253 | 42.95162 | 43.41365 | 44.18964 | 45.05761 | 45.93166 | 46.72349 | 47.1997 | 47.5099 |
9.5 | 43.10009 | 43.39458 | 43.85025 | 44.61764 | 45.47908 | 46.34979 | 47.14142 | 47.6188 | 47.93027 |
10.5 | 43.49049 | 43.7823 | 44.23432 | 44.99694 | 45.85506 | 46.72463 | 47.51714 | 47.99592 | 48.30867 |
11.5 | 43.83332 | 44.12399 | 44.57454 | 45.33549 | 46.19295 | 47.06318 | 47.85744 | 48.33781 | 48.65181 |
12.5 | 44.136 | 44.42679 | 44.87767 | 45.63952 | 46.49853 | 47.37091 | 48.16763 | 48.64972 | 48.96494 |
13.5 | 44.40441 | 44.69639 | 45.14908 | 45.91398 | 46.77638 | 47.65214 | 48.45191 | 48.93584 | 49.25225 |
14.5 | 44.64328 | 44.93733 | 45.3931 | 46.16284 | 47.03018 | 47.91038 | 48.71371 | 49.19955 | 49.51712 |
15.5 | 44.85646 | 45.15333 | 45.61325 | 46.38937 | 47.26295 | 48.14848 | 48.95578 | 49.44362 | 49.76233 |
16.5 | 45.04712 | 45.34746 | 45.81245 | 46.59626 | 47.47721 | 48.36881 | 49.18045 | 49.67034 | 49.99018 |
17.5 | 45.2179 | 45.52229 | 45.99315 | 46.78578 | 47.67504 | 48.57336 | 49.38963 | 49.88166 | 50.20261 |
18.5 | 45.37104 | 45.67997 | 46.15739 | 46.95981 | 47.85821 | 48.76379 | 49.58497 | 50.07919 | 50.40125 |
19.5 | 45.50843 | 45.82234 | 46.30692 | 47.11999 | 48.02822 | 48.94153 | 49.76786 | 50.26432 | 50.58751 |
20.5 | 45.63169 | 45.95096 | 46.44325 | 47.26769 | 48.18637 | 49.10781 | 49.93948 | 50.43825 | 50.76259 |
21.5 | 45.74221 | 46.06719 | 46.56767 | 47.40413 | 48.33377 | 49.2637 | 50.10089 | 50.60203 | 50.92752 |
22.5 | 45.84121 | 46.17221 | 46.68129 | 47.53035 | 48.4714 | 49.4101 | 50.25298 | 50.75654 | 51.08322 |
23.5 | 45.92974 | 46.26704 | 46.78511 | 47.64724 | 48.60011 | 49.54784 | 50.39655 | 50.90258 | 51.23047 |
24.5 | 46.00872 | 46.35259 | 46.87997 | 47.75563 | 48.72065 | 49.67762 | 50.53229 | 51.04085 | 51.36998 |
25.5 | 46.07898 | 46.42963 | 46.96663 | 47.85621 | 48.83367 | 49.80008 | 50.66082 | 51.17196 | 51.50236 |
26.5 | 46.14124 | 46.49889 | 47.04578 | 47.94962 | 48.93976 | 49.91578 | 50.78269 | 51.29647 | 51.62817 |
27.5 | 46.19614 | 46.56098 | 47.11801 | 48.0364 | 49.03945 | 50.02521 | 50.89839 | 51.41485 | 51.7479 |
28.5 | 46.24425 | 46.61646 | 47.18385 | 48.11707 | 49.13321 | 50.12883 | 51.00836 | 51.52756 | 51.86198 |
29.5 | 46.2861 | 46.66583 | 47.24379 | 48.19206 | 49.22146 | 50.22705 | 51.113 | 51.63499 | 51.97081 |
30.5 | 46.32214 | 46.70954 | 47.29824 | 48.26178 | 49.30458 | 50.32023 | 51.21268 | 51.73749 | 52.07475 |
31.5 | 46.3528 | 46.74801 | 47.34761 | 48.3266 | 49.38292 | 50.40869 | 51.3077 | 51.83539 | 52.17413 |
32.5 | 46.37844 | 46.78159 | 47.39225 | 48.38684 | 49.45678 | 50.49275 | 51.39837 | 51.92898 | 52.26923 |
33.5 | 46.39942 | 46.81061 | 47.43247 | 48.44281 | 49.52645 | 50.57267 | 51.48496 | 52.01853 | 52.36032 |
34.5 | 46.41605 | 46.8354 | 47.46857 | 48.49479 | 49.59218 | 50.6487 | 51.56771 | 52.10429 | 52.44764 |
35.5 | 46.4286 | 46.85621 | 47.50081 | 48.54301 | 49.65423 | 50.72108 | 51.64686 | 52.18646 | 52.53143 |
36 | 46.43344 | 46.86521 | 47.51556 | 48.56578 | 49.68394 | 50.75597 | 51.68514 | 52.22628 | 52.57205 |
Age (in months) | 3rd Percentile Head Circumference (in centimeters) | 5th Percentile Head Circumference (in centimeters) | 10th Percentile Head Circumference (in centimeters) | 25th Percentile Head Circumference (in centimeters) | 50th Percentile Head Circumference (in centimeters) | 75th Percentile Head Circumference (in centimeters) | 90th Percentile Head Circumference (in centimeters) | 95th Percentile Head Circumference (in centimeters) | 97th Percentile Head Circumference (in centimeters) |
---|---|---|---|---|---|---|---|---|---|
0 | 31.9302 | 32.2509 | 32.75949 | 33.65187 | 34.71156 | 35.85124 | 36.9535 | 37.65138 | 38.1211 |
0.5 | 33.38071 | 33.68744 | 34.17346 | 35.02508 | 36.03454 | 37.11807 | 38.16405 | 38.82535 | 39.27006 |
1.5 | 35.48627 | 35.7756 | 36.23326 | 37.03282 | 37.97672 | 38.98533 | 39.95459 | 40.56517 | 40.97482 |
2.5 | 36.9855 | 37.26522 | 37.70685 | 38.47603 | 39.38013 | 40.34145 | 41.26063 | 41.83732 | 42.22321 |
3.5 | 38.13114 | 38.40561 | 38.83814 | 39.58905 | 40.46774 | 41.39732 | 42.28153 | 42.83396 | 43.2026 |
4.5 | 39.04619 | 39.31814 | 39.74588 | 40.48611 | 41.34841 | 42.25604 | 43.11489 | 43.64924 | 44.00486 |
5.5 | 39.7996 | 40.07086 | 40.49672 | 41.23136 | 42.08335 | 42.97566 | 43.81575 | 44.3363 | 44.68183 |
6.5 | 40.43379 | 40.70567 | 41.13171 | 41.86435 | 42.71034 | 43.59207 | 44.41815 | 44.92803 | 45.26563 |
7.5 | 40.97672 | 41.25016 | 41.67787 | 42.41113 | 43.25429 | 44.12897 | 44.94461 | 45.44619 | 45.77751 |
8.5 | 41.44768 | 41.7234 | 42.15391 | 42.88978 | 43.7325 | 44.60282 | 45.41078 | 45.90591 | 46.23224 |
9.5 | 41.86058 | 42.13913 | 42.5733 | 43.31329 | 44.15743 | 45.0255 | 45.82799 | 46.31815 | 46.64053 |
10.5 | 42.22575 | 42.50755 | 42.94604 | 43.69135 | 44.53837 | 45.40587 | 46.20466 | 46.69106 | 47.01035 |
11.5 | 42.55105 | 42.83643 | 43.27977 | 44.03133 | 44.88241 | 45.75072 | 46.54726 | 47.0309 | 47.3478 |
12.5 | 42.8426 | 43.13182 | 43.58043 | 44.33899 | 45.19508 | 46.06532 | 46.86084 | 47.34255 | 47.65766 |
13.5 | 43.10526 | 43.39853 | 43.85274 | 44.61891 | 45.48078 | 46.3539 | 47.14942 | 47.62991 | 47.94373 |
14.5 | 43.34294 | 43.64042 | 44.1005 | 44.87476 | 45.74308 | 46.61986 | 47.41624 | 47.89613 | 48.20911 |
15.5 | 43.55883 | 43.86066 | 44.32682 | 45.10959 | 45.98487 | 46.86599 | 47.66399 | 48.1438 | 48.4563 |
16.5 | 43.75558 | 44.06186 | 44.53428 | 45.32587 | 46.20858 | 47.0946 | 47.89487 | 48.37505 | 48.68741 |
17.5 | 43.93539 | 44.2462 | 44.72501 | 45.5257 | 46.41622 | 47.30765 | 48.11074 | 48.5917 | 48.90419 |
18.5 | 44.10013 | 44.41553 | 44.90085 | 45.71086 | 46.6095 | 47.50676 | 48.31317 | 48.79526 | 49.10814 |
19.5 | 44.25137 | 44.57142 | 45.06333 | 45.88284 | 46.78989 | 47.69335 | 48.50351 | 48.98703 | 49.30052 |
20.5 | 44.39047 | 44.71521 | 45.21378 | 46.04295 | 46.95863 | 47.86861 | 48.6829 | 49.16814 | 49.48244 |
21.5 | 44.51861 | 44.84806 | 45.35334 | 46.19229 | 47.11681 | 48.0336 | 48.85236 | 49.33955 | 49.65484 |
22.5 | 44.6368 | 44.97099 | 45.48301 | 46.33184 | 47.26538 | 48.18923 | 49.01276 | 49.50211 | 49.81854 |
23.5 | 44.74593 | 45.08487 | 45.60367 | 46.46246 | 47.40516 | 48.33629 | 49.16486 | 49.65657 | 49.97429 |
24.5 | 44.84678 | 45.19047 | 45.71608 | 46.58489 | 47.53688 | 48.47548 | 49.30933 | 49.80358 | 50.12271 |
25.5 | 44.94005 | 45.2885 | 45.82092 | 46.6998 | 47.66118 | 48.60743 | 49.44677 | 49.94373 | 50.26437 |
26.5 | 45.02634 | 45.37954 | 45.91878 | 46.80778 | 47.77865 | 48.7327 | 49.57773 | 50.07751 | 50.39978 |
27.5 | 45.1062 | 45.46415 | 46.01021 | 46.90935 | 47.88979 | 48.85178 | 49.70266 | 50.20541 | 50.5294 |
28.5 | 45.18011 | 45.5428 | 46.09568 | 47.00499 | 47.99506 | 48.9651 | 49.822 | 50.32783 | 50.65362 |
29.5 | 45.24852 | 45.61594 | 46.17562 | 47.09511 | 48.09488 | 49.07308 | 49.93613 | 50.44514 | 50.77281 |
30.5 | 45.31181 | 45.68394 | 46.25043 | 47.18009 | 48.18961 | 49.17607 | 50.0454 | 50.55769 | 50.88731 |
31.5 | 45.37035 | 45.74718 | 46.32044 | 47.2603 | 48.2796 | 49.2744 | 50.15012 | 50.66578 | 50.99741 |
32.5 | 45.42444 | 45.80596 | 46.38599 | 47.33603 | 48.36515 | 49.36836 | 50.25058 | 50.76968 | 51.10338 |
33.5 | 45.4744 | 45.86058 | 46.44736 | 47.40757 | 48.44654 | 49.45823 | 50.34704 | 50.86965 | 51.20547 |
34.5 | 45.52047 | 45.9113 | 46.50481 | 47.47518 | 48.52402 | 49.54425 | 50.43974 | 50.96593 | 51.30392 |
35.5 | 45.56291 | 45.95837 | 46.55859 | 47.53911 | 48.59783 | 49.62665 | 50.52889 | 51.05872 | 51.39892 |
36 | 45.58284 | 45.98061 | 46.58417 | 47.56976 | 48.63342 | 49.66656 | 50.5722 | 51.10387 | 51.44519 |