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