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Industry standard for baby apparel is to use age as the size, but it is important to measure your child as it is

possible to have an older child that still needs a smaller size, or conversely a younger child that needs to size up.

Age-group Top Length (in inches) Top Round Chest (in inches) Bottom Length (in inches) Bottom Round Width (in inches)
1-2 yrs 11" 20" 12" 17"
2-3 yrs 12" 20" 13" 18"
3-4 yrs 13" 21" 16" 20"
4-5yrs 14" 23" 19" 20"
5-6yrs 15" 24" 22" 22"
6-7yrs 16" 27" 25" 23"
7-8yrs 17" 28" 28" 26"
8-9yrs 18" 31" 30" 27"
9-10yrs 19" 31" 32" 29"
10-11yrs 20" 34" 36" 31"