Child care

Ideal Weight for Infants

1st Year

Month Normal range (5th to 95th percentile) in kg. Median (50th percentile) in kg.
0 2.4 – 4.2 3.1
1 3.0 – 5.4 3.75
2 3.6 – 6.4 5.1
3 4.2 – 7.5 5.9
4 4.7 – 8.1 6.5
5 5.3 – 8.9 7.2
6 5.8 – 9.5 7.9
7 6.2 – 10.0 8.3
8 6.5 – 10.5 8.8
9 7.0 – 11.0 9.1
10 7.3 – 11.3 9.5
11 7.5 – 11.6 9.8
12 7.8 – 12.0 10.2

2nd Year

Month Normal range (5th to 95th percentile) in kg. Median (50th percentile) in kg.
12 7.8 – 12.0 10.2
14 8.2 – 12.5 10.6
16 8.5 – 13.0 11.0
18 8.9 – 13.4 11.5
20 9.2 – 13.8 11.8
22 9.5 – 14.2 12.2
24 9.8 – 14.7 12.5


3rd Year

Month Normal range (5th to 95th percentile) in kg. Median (50th percentile) in kg.
24 9.8 – 14.7 12.5
26 10.1 – 15.1 12.9
28 10.4 – 15.5 13.2
30 10.6 – 16.0 13.6
32 11.0 – 16.4 13.9
34 11.2 – 16.8 14.2
36 11.5 – 17.2 14.6

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