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Baby Size Chart

US Size  Age  Weight 
(in lbs.)
Length 
(in inches)
P Preemie Up to 5 Up to 17
NB Newborn 5-8 Up to 20
3M 0-3 Months 8-12.5 20-23.5
6M 3-6 Months 13-16.5 24-25.5
9M 6-9 Months 17-20.5 26-27.5
12M 9-12 Months 21-23.5 28-30.5
18M 12-18 Months 24-26.5 31-32.5
24M 18-24 Months 27-30 33-34.5