head circumference percentiles P3–P97, World Health Organization

World Health Organization’s published head circumference figures, P3 to P97 month by month, up to 5 years. Boys and girls separately.

boy

Age in years runs along the bottom and head circumference（cm） up the side. The five lines are, from the bottom, the 3rd, 15th, 50th, 85th and 97th percentiles, ranging from 32.1 to 53.5. The full figures are in the table above.

World Health Organization percentile curves for head circumference, boy.

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yearsmonths

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World Health Organization · head circumference, boy（cm）
Age	P3	P15	P50	P85	P97
0 months	32.1	33.1	34.5	35.8	36.9
1 months	35.1	36.1	37.3	38.5	39.5
2 months	36.9	37.9	39.1	40.3	41.3
3 months	38.3	39.3	40.5	41.7	42.7
4 months	39.4	40.4	41.6	42.9	43.9
5 months	40.3	41.3	42.6	43.8	44.8
6 months	41.0	42.1	43.3	44.6	45.6
7 months	41.7	42.7	44.0	45.3	46.3
8 months	42.2	43.2	44.5	45.8	46.9
9 months	42.6	43.7	45.0	46.3	47.4
10 months	43.0	44.1	45.4	46.7	47.8
11 months	43.4	44.4	45.8	47.1	48.2
12 months	43.6	44.7	46.1	47.4	48.5
13 months	43.9	45.0	46.3	47.7	48.8
14 months	44.1	45.2	46.6	47.9	49.0
15 months	44.3	45.5	46.8	48.2	49.3
16 months	44.5	45.6	47.0	48.4	49.5
17 months	44.7	45.8	47.2	48.6	49.7
18 months	44.9	46.0	47.4	48.7	49.9
19 months	45.0	46.2	47.5	48.9	50.0
20 months	45.2	46.3	47.7	49.1	50.2
21 months	45.3	46.4	47.8	49.2	50.4
22 months	45.4	46.6	48.0	49.4	50.5
23 months	45.6	46.7	48.1	49.5	50.7
2 years	45.7	46.8	48.3	49.7	50.8
2y 3m	46.0	47.2	48.6	50.0	51.2
2y 6m	46.3	47.5	48.9	50.4	51.6
2y 9m	46.6	47.8	49.2	50.7	51.9
3 years	46.8	48.0	49.5	50.9	52.1
3y 3m	47.0	48.2	49.7	51.2	52.4
3y 6m	47.2	48.4	49.9	51.4	52.6
3y 9m	47.3	48.5	50.1	51.6	52.8
4 years	47.5	48.7	50.2	51.7	53.0
4y 3m	47.6	48.8	50.4	51.9	53.1
4y 6m	47.7	49.0	50.5	52.0	53.3
4y 9m	47.8	49.1	50.6	52.2	53.4
5 years	47.9	49.2	50.7	52.3	53.5

girl

Age in years runs along the bottom and head circumference（cm） up the side. The five lines are, from the bottom, the 3rd, 15th, 50th, 85th and 97th percentiles, ranging from 31.7 to 52.6. The full figures are in the table above.

World Health Organization percentile curves for head circumference, girl.

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yearsmonths

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World Health Organization · head circumference, girl（cm）
Age	P3	P15	P50	P85	P97
0 months	31.7	32.7	33.9	35.1	36.1
1 months	34.3	35.3	36.5	37.8	38.8
2 months	36.0	37.0	38.3	39.5	40.5
3 months	37.2	38.2	39.5	40.8	41.9
4 months	38.2	39.3	40.6	41.9	43.0
5 months	39.0	40.1	41.5	42.8	43.9
6 months	39.7	40.8	42.2	43.5	44.6
7 months	40.4	41.5	42.8	44.2	45.3
8 months	40.9	42.0	43.4	44.7	45.9
9 months	41.3	42.4	43.8	45.2	46.3
10 months	41.7	42.8	44.2	45.6	46.8
11 months	42.0	43.2	44.6	46.0	47.1
12 months	42.3	43.5	44.9	46.3	47.5
13 months	42.6	43.8	45.2	46.6	47.7
14 months	42.9	44.0	45.4	46.8	48.0
15 months	43.1	44.2	45.7	47.1	48.2
16 months	43.3	44.4	45.9	47.3	48.5
17 months	43.5	44.6	46.1	47.5	48.7
18 months	43.6	44.8	46.2	47.7	48.8
19 months	43.8	45.0	46.4	47.8	49.0
20 months	44.0	45.1	46.6	48.0	49.2
21 months	44.1	45.3	46.7	48.2	49.4
22 months	44.3	45.4	46.9	48.3	49.5
23 months	44.4	45.6	47.0	48.5	49.7
2 years	44.6	45.7	47.2	48.6	49.8
2y 3m	44.9	46.1	47.6	49.0	50.2
2y 6m	45.3	46.5	47.9	49.4	50.6
2y 9m	45.6	46.8	48.2	49.7	50.9
3 years	45.9	47.0	48.5	50.0	51.2
3y 3m	46.1	47.3	48.7	50.2	51.4
3y 6m	46.3	47.5	49.0	50.4	51.6
3y 9m	46.5	47.7	49.2	50.6	51.8
4 years	46.7	47.9	49.3	50.8	52.0
4y 3m	46.8	48.0	49.5	51.0	52.2
4y 6m	47.0	48.2	49.6	51.1	52.3
4y 9m	47.1	48.3	49.8	51.3	52.5
5 years	47.2	48.4	49.9	51.4	52.6

About this table

From 5 years the reference becomes WHO Growth Reference 2007, where the overweight cut-off tightens from above +2 SD to above +1 SD. A label can move up a step on the fifth birthday. That is the join between two tables.