arm circumference percentiles P3–P97, United States

United States’s published arm 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 arm circumference（cm） up the side. The five lines are, from the bottom, the 3rd, 15th, 50th, 85th and 97th percentiles, ranging from 11.7 to 17.5. The full figures are in the table above.

United States percentile curves for arm circumference, boy.

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yearsmonths

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United States · arm circumference, boy（cm）
Age	P3	P15	P50	P85	P97
3 months	11.7	12.5	13.5	14.6	15.5
4 months	11.9	12.8	13.8	14.9	15.9
5 months	12.2	13.0	14.1	15.2	16.2
6 months	12.3	13.1	14.2	15.4	16.4
7 months	12.4	13.3	14.4	15.5	16.5
8 months	12.5	13.3	14.5	15.6	16.7
9 months	12.5	13.4	14.5	15.7	16.7
10 months	12.6	13.5	14.6	15.8	16.8
11 months	12.6	13.5	14.6	15.8	16.9
12 months	12.7	13.5	14.6	15.9	16.9
13 months	12.7	13.5	14.7	15.9	16.9
14 months	12.7	13.6	14.7	15.9	17.0
15 months	12.7	13.6	14.7	16.0	17.0
16 months	12.8	13.6	14.8	16.0	17.1
17 months	12.8	13.7	14.8	16.0	17.1
18 months	12.8	13.7	14.8	16.1	17.2
19 months	12.9	13.7	14.9	16.1	17.2
20 months	12.9	13.8	14.9	16.2	17.3
21 months	13.0	13.8	15.0	16.2	17.3
22 months	13.0	13.9	15.0	16.3	17.4
23 months	13.1	13.9	15.1	16.4	17.5

girl

Age in years runs along the bottom and arm circumference（cm） up the side. The five lines are, from the bottom, the 3rd, 15th, 50th, 85th and 97th percentiles, ranging from 11.2 to 17.3. The full figures are in the table above.

United States percentile curves for arm circumference, girl.

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United States · arm circumference, girl（cm）
Age	P3	P15	P50	P85	P97
3 months	11.2	12.0	13.0	14.2	15.3
4 months	11.5	12.3	13.4	14.6	15.7
5 months	11.7	12.5	13.6	14.8	15.9
6 months	11.8	12.6	13.8	15.0	16.2
7 months	11.9	12.8	13.9	15.2	16.3
8 months	12.0	12.8	14.0	15.3	16.4
9 months	12.0	12.9	14.1	15.3	16.5
10 months	12.1	13.0	14.1	15.4	16.6
11 months	12.1	13.0	14.2	15.4	16.6
12 months	12.2	13.0	14.2	15.5	16.6
13 months	12.2	13.1	14.2	15.5	16.7
14 months	12.3	13.1	14.3	15.6	16.7
15 months	12.3	13.2	14.3	15.6	16.8
16 months	12.4	13.2	14.4	15.7	16.8
17 months	12.4	13.3	14.4	15.7	16.9
18 months	12.4	13.3	14.5	15.8	16.9
19 months	12.5	13.4	14.5	15.8	17.0
20 months	12.6	13.4	14.6	15.9	17.0
21 months	12.6	13.5	14.7	16.0	17.1
22 months	12.7	13.6	14.7	16.0	17.2
23 months	12.7	13.6	14.8	16.1	17.3

About this table

The United States reads two charts by age, on CDC’s 2010 recommendation: WHO 2006 below 24 months, CDC 2000 from 2 to 19 years. They are different kinds of chart — WHO describes how healthy children should grow, CDC records how American children did grow.