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National Center for Health Statistics

Data Table of Infant Head Circumference-for-age Charts

Males, Birth – 36 Months
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

Females, Birth – 36 Months
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
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