Line chart of normal weight in kg for US girls. The 50th percentile weight is 3.23 at birth, 9.53 at 1 year, 11.80 at 2 years, 14.10 at 3 years, 15.96 at 4 years, 17.66 at 5 years, 32.55 at 10 years, 53.68 at 15 years, and 56.62 at 18 years old.

Normal weight in kg for North American (USA) girls of age (in months) between birth and 18 years old. The blue line represents the mean value (50th percentile), while the upper red line represents the 90th percentile, and the lower red line the 10th percentile.
Value labels above the middle line are rounded to the kg. Values with two decimals are given in the table below.

 

Normal weight for US girls
between birth and 18 years old

Age
(Month)

Weight
(kg)

10th Percentile 50th Percentile 90th Percentile
Birth 2.58 3.23 3.64
1 3.22 3.98 4.65
3 4.47 5.40 6.39
6 6.12 7.21 8.38
9 7.34 8.56 9.83
12 8.19 9.53 10.87
18 9.30 10.82 12.30
24 10.32 11.80 13.58
30 11.35 13.03 15.16
36 12.26 14.10 16.54
42 13.08 15.07 17.77
48 13.84 15.96 18.93
54 14.56 16.81 20.06
60 15.26 17.66 21.23
66 15.97 18.56 22.48
72 16.72 19.52 23.89
78 17.51 20.61 25.50
84 18.39 21.84 27.39
90 19.37 23.26 29.57
96 20.45 24.84 32.04
102 21.64 26.58 34.73
108 22.92 28.46 37.60
114 24.29 30.45 40.61
120 25.76 32.55 43.70
126 27.32 34.72 46.84
132 28.97 36.95 49.96
138 30.71 39.23 53.03
144 32.53 41.53 55.99
150 34.42 43.84 58.81
156 36.35 46.10 61.45
162 38.26 48.26 63.87
168 40.11 50.28 66.04
174 41.83 52.10 67.95
180 43.38 53.68 69.54
186 44.72 54.96 70.79
192 45.78 55.89 71.68
198 46.54 56.44 72.18
204 47.04 56.69 72.38
210 47.33 56.71 72.37
216 47.47 56.62 72.25

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  Calculate the expected infant's weight with areppim's Infant Growth Calculator.

 

Sources: see Wissenschaftliche Tabellen

 

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