Sizing by weight is recommended. Sizing fits most.

SIZE WEIGHT LENGTH
​preemie ​Under 7 lbs ​Under 19"
​0m ​Up to 9 lbs ​Up to 20"
​0-3m ​9-13​ lbs ​Up to 23"
​3-6m ​13-18 lbs ​Up to 26"
​​6-9m ​​18-23 lbs ​Up to 2​9"
​​9-12m ​​23-28​​ lbs ​Up to​ 32"