head circumference percentiles P3–P97, Chinese mainland

Chinese mainland’s published head circumference figures, P3 to P97 month by month, up to 3 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 31.9 to 51.9. The full figures are in the table above.

Chinese mainland percentile curves for head circumference, boy.

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yearsmonths

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Chinese mainland · head circumference, boy（cm）
Age	P3	P15	P50	P85	P97
0 months	31.9	33.0	34.3	35.6	36.7
1 months	34.7	35.8	37.0	38.2	39.3
2 months	36.9	37.9	39.1	40.2	41.3
3 months	38.3	39.3	40.5	41.6	42.7
4 months	39.4	40.4	41.6	42.8	43.9
5 months	40.3	41.3	42.5	43.8	44.9
6 months	41.1	42.1	43.4	44.6	45.7
7 months	41.8	42.8	44.0	45.3	46.4
8 months	42.3	43.4	44.6	45.9	47.0
9 months	42.8	43.9	45.1	46.4	47.5
10 months	43.2	44.3	45.5	46.8	47.9
11 months	43.5	44.6	45.8	47.1	48.2
12 months	43.8	44.9	46.1	47.4	48.5
13 months	44.1	45.1	46.4	47.7	48.8
14 months	44.3	45.4	46.6	47.9	49.0
15 months	44.5	45.6	46.8	48.1	49.2
16 months	44.7	45.8	47.0	48.3	49.4
17 months	44.8	45.9	47.2	48.5	49.6
18 months	45.0	46.1	47.4	48.7	49.8
19 months	45.2	46.3	47.5	48.9	50.0
20 months	45.4	46.5	47.7	49.1	50.2
21 months	45.5	46.6	47.9	49.2	50.3
22 months	45.7	46.8	48.1	49.4	50.5
23 months	45.9	47.0	48.2	49.6	50.7
2 years	46.0	47.1	48.3	49.7	50.8
2y 3m	46.3	47.4	48.7	50.0	51.1
2y 6m	46.6	47.7	48.9	50.3	51.4
2y 9m	46.8	47.9	49.2	50.6	51.7
3 years	47.0	48.1	49.3	50.8	51.9

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 31.6 to 51. The full figures are in the table above.

Chinese mainland percentile curves for head circumference, girl.

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yearsmonths

Download head circumference for every region as CSV

Chinese mainland · head circumference, girl（cm）
Age	P3	P15	P50	P85	P97
0 months	31.6	32.7	33.9	35.2	36.3
1 months	34.1	35.2	36.3	37.5	38.5
2 months	36.1	37.1	38.2	39.3	40.3
3 months	37.4	38.4	39.5	40.7	41.7
4 months	38.4	39.4	40.6	41.7	42.8
5 months	39.3	40.3	41.5	42.6	43.7
6 months	40.0	41.1	42.2	43.4	44.5
7 months	40.7	41.7	42.9	44.1	45.2
8 months	41.2	42.3	43.5	44.7	45.8
9 months	41.7	42.8	44.0	45.2	46.3
10 months	42.1	43.2	44.4	45.6	46.7
11 months	42.5	43.6	44.8	46.0	47.1
12 months	42.8	43.9	45.1	46.4	47.5
13 months	43.1	44.2	45.4	46.6	47.7
14 months	43.3	44.4	45.6	46.9	48.0
15 months	43.5	44.6	45.9	47.1	48.2
16 months	43.7	44.8	46.1	47.3	48.4
17 months	43.9	45.0	46.2	47.5	48.6
18 months	44.1	45.2	46.4	47.7	48.8
19 months	44.2	45.3	46.6	47.9	49.0
20 months	44.4	45.5	46.7	48.0	49.1
21 months	44.5	45.6	46.9	48.2	49.3
22 months	44.7	45.8	47.1	48.4	49.5
23 months	44.8	45.9	47.2	48.5	49.6
2 years	45.0	46.1	47.3	48.7	49.8
2y 3m	45.3	46.4	47.6	49.0	50.1
2y 6m	45.6	46.7	47.9	49.3	50.4
2y 9m	45.8	46.9	48.2	49.6	50.7
3 years	46.1	47.2	48.5	49.9	51.0

About this table

Ages 6.0 to 6.75 are screened for undernutrition by both WS/T 423-2022, which gives a continuous z-score, and WS/T 456-2014, which gives half-year cut-offs. Both are shown rather than one being picked for the other.
Ages 6.0 to 6.75 are covered by both WS/T 423-2022 and WS/T 586-2018, which can reach different conclusions. Throughout that overlap the figures here come from 423.
From 7 years the Chinese national standards stop giving a continuous z-score. Overweight and obesity are screened against BMI cut-offs, and height is reported as a grade.