Normal 50th percentile weight in kg for US boys is 3.27 at birth, 10.15 at 1 year, 12.34 at 2 years, 14.62 at 3 years, 16.69 at 4 years, 18.67 at 5 years, 31.44 at 10 years, 56.71 at 15 years, and 68.88 at 18 years old.

Normal weight in kg for US boys 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.

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