When trying to decide between two sizes, choose the larger size for a better fit.

SizeSize/Age RangeChestHeightWeight
0-6 MonthsNewborn-6 months8 3/4"12 1/2"5.0 oz
6-12 Months6 Months-12 Months9 3/4"13 1/2"5.0 oz
12-18 Months12 Months-18 Months10 3/4"14 1/2"5.0 oz
18-24 Months18 Months-24 Months11 3/4"15 1/2"5.0 oz
One Size
2T2 Years13"15 1/2"4.5 oz
3T3 Years14"16 1/2"4.5 oz
4T4 Years15"17 1/2"4.5 oz