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

SizeChestWaistHipsHeightWeight
Newborn (0-6)17 - 1817 - 181823 - 2612-18
Infant (6-12)18 - 1918 - 191926 - 29.516-22
Infant (12-18)19 - 2019 - 202029.5 - 31.520-26
Infant (18-24)20 - 2119 - 202131.5 - 33.524-28
Toddler (1-2)20 - 2119 - 202131.5 - 33.524-28
Toddler (3-4)21 - 2320 - 212333.5 - 41.529-38
*in inches