Boys Head Circumference-for-age (3rd through 97th percentiles)
3rd Percentile
| Age (in months) | Head Circumference (in centimeters) |
|---|---|
| 0 | 31.48762 |
| 0.5 | 33.25006 |
| 1.5 | 35.78126 |
| 2.5 | 37.5588 |
| 3.5 | 38.89944 |
| 4.5 | 39.95673 |
| 5.5 | 40.81642 |
| 6.5 | 41.53109 |
| 7.5 | 42.13521 |
| 8.5 | 42.65253 |
| 9.5 | 43.10009 |
| 10.5 | 43.49049 |
| 11.5 | 43.83332 |
| 12.5 | 44.136 |
| 13.5 | 44.40441 |
| 14.5 | 44.64328 |
| 15.5 | 44.85646 |
| 16.5 | 45.04712 |
| 17.5 | 45.2179 |
| 18.5 | 45.37104 |
| 19.5 | 45.50843 |
| 20.5 | 45.63169 |
| 21.5 | 45.74221 |
| 22.5 | 45.84121 |
| 23.5 | 45.92974 |
| 24.5 | 46.00872 |
| 25.5 | 46.07898 |
| 26.5 | 46.14124 |
| 27.5 | 46.19614 |
| 28.5 | 46.24425 |
| 29.5 | 46.2861 |
| 30.5 | 46.32214 |
| 31.5 | 46.3528 |
| 32.5 | 46.37844 |
| 33.5 | 46.39942 |
| 34.5 | 46.41605 |
| 35.5 | 46.4286 |
| 36 | 46.43344 |
5th Percentile
| Age (in months) | Head Circumference (in centimeters) |
|---|---|
| 0 | 32.14881 |
| 0.5 | 33.83392 |
| 1.5 | 36.26428 |
| 2.5 | 37.97959 |
| 3.5 | 39.27893 |
| 4.5 | 40.30766 |
| 5.5 | 41.14714 |
| 6.5 | 41.84742 |
| 7.5 | 42.44134 |
| 8.5 | 42.95162 |
| 9.5 | 43.39458 |
| 10.5 | 43.7823 |
| 11.5 | 44.12399 |
| 12.5 | 44.42679 |
| 13.5 | 44.69639 |
| 14.5 | 44.93733 |
| 15.5 | 45.15333 |
| 16.5 | 45.34746 |
| 17.5 | 45.52229 |
| 18.5 | 45.67997 |
| 19.5 | 45.82234 |
| 20.5 | 45.95096 |
| 21.5 | 46.06719 |
| 22.5 | 46.17221 |
| 23.5 | 46.26704 |
| 24.5 | 46.35259 |
| 25.5 | 46.42963 |
| 26.5 | 46.49889 |
| 27.5 | 46.56098 |
| 28.5 | 46.61646 |
| 29.5 | 46.66583 |
| 30.5 | 46.70954 |
| 31.5 | 46.74801 |
| 32.5 | 46.78159 |
| 33.5 | 46.81061 |
| 34.5 | 46.8354 |
| 35.5 | 46.85621 |
| 36 | 46.86521 |
10th Percentile
| Age (in months) | Head Circumference (in centimeters) |
|---|---|
| 0 | 33.08389 |
| 0.5 | 34.67253 |
| 1.5 | 36.97377 |
| 2.5 | 38.60724 |
| 3.5 | 39.85123 |
| 4.5 | 40.84114 |
| 5.5 | 41.65291 |
| 6.5 | 42.3333 |
| 7.5 | 42.91311 |
| 8.5 | 43.41365 |
| 9.5 | 43.85025 |
| 10.5 | 44.23432 |
| 11.5 | 44.57454 |
| 12.5 | 44.87767 |
| 13.5 | 45.14908 |
| 14.5 | 45.3931 |
| 15.5 | 45.61325 |
| 16.5 | 45.81245 |
| 17.5 | 45.99315 |
| 18.5 | 46.15739 |
| 19.5 | 46.30692 |
| 20.5 | 46.44325 |
| 21.5 | 46.56767 |
| 22.5 | 46.68129 |
| 23.5 | 46.78511 |
| 24.5 | 46.87997 |
| 25.5 | 46.96663 |
| 26.5 | 47.04578 |
| 27.5 | 47.11801 |
| 28.5 | 47.18385 |
| 29.5 | 47.24379 |
| 30.5 | 47.29824 |
| 31.5 | 47.34761 |
| 32.5 | 47.39225 |
| 33.5 | 47.43247 |
| 34.5 | 47.46857 |
| 35.5 | 47.50081 |
| 36 | 47.51556 |
25th Percentile
| Age (in months) | Head Circumference (in centimeters) |
|---|---|
| 0 | 34.46952 |
| 0.5 | 35.93987 |
| 1.5 | 38.07878 |
| 2.5 | 39.60637 |
| 3.5 | 40.77713 |
| 4.5 | 41.71483 |
| 5.5 | 42.48889 |
| 6.5 | 43.14204 |
| 7.5 | 43.70245 |
| 8.5 | 44.18964 |
| 9.5 | 44.61764 |
| 10.5 | 44.99694 |
| 11.5 | 45.33549 |
| 12.5 | 45.63952 |
| 13.5 | 45.91398 |
| 14.5 | 46.16284 |
| 15.5 | 46.38937 |
| 16.5 | 46.59626 |
| 17.5 | 46.78578 |
| 18.5 | 46.95981 |
| 19.5 | 47.11999 |
| 20.5 | 47.26769 |
| 21.5 | 47.40413 |
| 22.5 | 47.53035 |
| 23.5 | 47.64724 |
| 24.5 | 47.75563 |
| 25.5 | 47.85621 |
| 26.5 | 47.94962 |
| 27.5 | 48.0364 |
| 28.5 | 48.11707 |
| 29.5 | 48.19206 |
| 30.5 | 48.26178 |
| 31.5 | 48.3266 |
| 32.5 | 48.38684 |
| 33.5 | 48.44281 |
| 34.5 | 48.49479 |
| 35.5 | 48.54301 |
| 36 | 48.56578 |
50th Percentile
| Age (in months) | Head Circumference (in centimeters) |
|---|---|
| 0 | 35.81367 |
| 0.5 | 37.19361 |
| 1.5 | 39.20743 |
| 2.5 | 40.65233 |
| 3.5 | 41.76517 |
| 4.5 | 42.66116 |
| 5.5 | 43.40489 |
| 6.5 | 44.0361 |
| 7.5 | 44.58097 |
| 8.5 | 45.05761 |
| 9.5 | 45.47908 |
| 10.5 | 45.85506 |
| 11.5 | 46.19295 |
| 12.5 | 46.49853 |
| 13.5 | 46.77638 |
| 14.5 | 47.03018 |
| 15.5 | 47.26295 |
| 16.5 | 47.47721 |
| 17.5 | 47.67504 |
| 18.5 | 47.85821 |
| 19.5 | 48.02822 |
| 20.5 | 48.18637 |
| 21.5 | 48.33377 |
| 22.5 | 48.4714 |
| 23.5 | 48.60011 |
| 24.5 | 48.72065 |
| 25.5 | 48.83367 |
| 26.5 | 48.93976 |
| 27.5 | 49.03945 |
| 28.5 | 49.13321 |
| 29.5 | 49.22146 |
| 30.5 | 49.30458 |
| 31.5 | 49.38292 |
| 32.5 | 49.45678 |
| 33.5 | 49.52645 |
| 34.5 | 49.59218 |
| 35.5 | 49.65423 |
| 36 | 49.68394 |
75th Percentile
| Age (in months) | Head Circumference (in centimeters) |
|---|---|
| 0 | 37.00426 |
| 0.5 | 38.32125 |
| 1.5 | 40.24987 |
| 2.5 | 41.63968 |
| 3.5 | 42.71455 |
| 4.5 | 43.58358 |
| 5.5 | 44.30801 |
| 6.5 | 44.92555 |
| 7.5 | 45.46104 |
| 8.5 | 45.93166 |
| 9.5 | 46.34979 |
| 10.5 | 46.72463 |
| 11.5 | 47.06318 |
| 12.5 | 47.37091 |
| 13.5 | 47.65214 |
| 14.5 | 47.91038 |
| 15.5 | 48.14848 |
| 16.5 | 48.36881 |
| 17.5 | 48.57336 |
| 18.5 | 48.76379 |
| 19.5 | 48.94153 |
| 20.5 | 49.10781 |
| 21.5 | 49.2637 |
| 22.5 | 49.4101 |
| 23.5 | 49.54784 |
| 24.5 | 49.67762 |
| 25.5 | 49.80008 |
| 26.5 | 49.91578 |
| 27.5 | 50.02521 |
| 28.5 | 50.12883 |
| 29.5 | 50.22705 |
| 30.5 | 50.32023 |
| 31.5 | 50.40869 |
| 32.5 | 50.49275 |
| 33.5 | 50.57267 |
| 34.5 | 50.6487 |
| 35.5 | 50.72108 |
| 36 | 50.75597 |
90th Percentile
| Age (in months) | Head Circumference (in centimeters) |
|---|---|
| 0 | 37.97379 |
| 0.5 | 39.24989 |
| 1.5 | 41.12605 |
| 2.5 | 42.48436 |
| 3.5 | 43.53902 |
| 4.5 | 44.39472 |
| 5.5 | 45.11034 |
| 6.5 | 45.72225 |
| 7.5 | 46.25443 |
| 8.5 | 46.72349 |
| 9.5 | 47.14142 |
| 10.5 | 47.51714 |
| 11.5 | 47.85744 |
| 12.5 | 48.16763 |
| 13.5 | 48.45191 |
| 14.5 | 48.71371 |
| 15.5 | 48.95578 |
| 16.5 | 49.18045 |
| 17.5 | 49.38963 |
| 18.5 | 49.58497 |
| 19.5 | 49.76786 |
| 20.5 | 49.93948 |
| 21.5 | 50.10089 |
| 22.5 | 50.25298 |
| 23.5 | 50.39655 |
| 24.5 | 50.53229 |
| 25.5 | 50.66082 |
| 26.5 | 50.78269 |
| 27.5 | 50.89839 |
| 28.5 | 51.00836 |
| 29.5 | 51.113 |
| 30.5 | 51.21268 |
| 31.5 | 51.3077 |
| 32.5 | 51.39837 |
| 33.5 | 51.48496 |
| 34.5 | 51.56771 |
| 35.5 | 51.64686 |
| 36 | 51.68514 |
95th Percentile
| Age (in months) | Head Circumference (in centimeters) |
|---|---|
| 0 | 38.51574 |
| 0.5 | 39.77262 |
| 1.5 | 41.62581 |
| 2.5 | 42.97189 |
| 3.5 | 44.01984 |
| 4.5 | 44.87197 |
| 5.5 | 45.58593 |
| 6.5 | 46.19736 |
| 7.5 | 46.72983 |
| 8.5 | 47.1997 |
| 9.5 | 47.6188 |
| 10.5 | 47.99592 |
| 11.5 | 48.33781 |
| 12.5 | 48.64972 |
| 13.5 | 48.93584 |
| 14.5 | 49.19955 |
| 15.5 | 49.44362 |
| 16.5 | 49.67034 |
| 17.5 | 49.88166 |
| 18.5 | 50.07919 |
| 19.5 | 50.26432 |
| 20.5 | 50.43825 |
| 21.5 | 50.60203 |
| 22.5 | 50.75654 |
| 23.5 | 50.90258 |
| 24.5 | 51.04085 |
| 25.5 | 51.17196 |
| 26.5 | 51.29647 |
| 27.5 | 51.41485 |
| 28.5 | 51.52756 |
| 29.5 | 51.63499 |
| 30.5 | 51.73749 |
| 31.5 | 51.83539 |
| 32.5 | 51.92898 |
| 33.5 | 52.01853 |
| 34.5 | 52.10429 |
| 35.5 | 52.18646 |
| 36 | 52.22628 |
97th Percentile
| Age (in months) | Head Circumference (in centimeters) |
|---|---|
| 0 | 38.85417 |
| 0.5 | 40.10028 |
| 1.5 | 41.94138 |
| 2.5 | 43.28181 |
| 3.5 | 44.32733 |
| 4.5 | 45.17877 |
| 5.5 | 45.893 |
| 6.5 | 46.50524 |
| 7.5 | 47.0388 |
| 8.5 | 47.5099 |
| 9.5 | 47.93027 |
| 10.5 | 48.30867 |
| 11.5 | 48.65181 |
| 12.5 | 48.96494 |
| 13.5 | 49.25225 |
| 14.5 | 49.51712 |
| 15.5 | 49.76233 |
| 16.5 | 49.99018 |
| 17.5 | 50.20261 |
| 18.5 | 50.40125 |
| 19.5 | 50.58751 |
| 20.5 | 50.76259 |
| 21.5 | 50.92752 |
| 22.5 | 51.08322 |
| 23.5 | 51.23047 |
| 24.5 | 51.36998 |
| 25.5 | 51.50236 |
| 26.5 | 51.62817 |
| 27.5 | 51.7479 |
| 28.5 | 51.86198 |
| 29.5 | 51.97081 |
| 30.5 | 52.07475 |
| 31.5 | 52.17413 |
| 32.5 | 52.26923 |
| 33.5 | 52.36032 |
| 34.5 | 52.44764 |
| 35.5 | 52.53143 |
| 36 | 52.57205 |
Page last reviewed: August 23, 2001