Size Chart
NB	5-8 lbs	up to 21.5"
3 mo.	8-12.5 lbs	21.5-24"
6 mo.	12.5-16.5 lbs	24-26.5"
9 mo.	16.5-20.5 lbs	26.5-28.5"
12 mo.	20.5-24.5 lbs	28.5-30.5"
18 mo.	24.5-27.5 lbs	30.5-32.5"
24 mo.	27.5-30 lbs	32.5-34"

Size chart is a general guide. It may include sizes that are unavailable for this item.