The best place to start to find the size is to check out the sizing chart! Please note that sizing is based on height, weight, and body type vs age.
Please note that this should work as a guide as each little Bee is so very different but a team member is happy to help find the right size for your little one! Also, remember since our Baby, Toddler and Kids PJs do not contain flame retardants they are made snug-fitting
https://www.burtsbeesbaby.com/baby-clothes-size-chart