Based on a lot of reviews stating these ran small I went up a size and bought 4t for my 31lb almost 3 year old who is in between size 5 and 6 diapers. He is quite tall for his age. They are actually a bit big on him and 3t probably would have fit perfect but these should continue to fit throughout the winter if we still need to use them. So I would say if your child is in size 5 diapers as around 30lb the 3t size would fit just fine.
Aablexema Newborn Cotton Footie Pajamas With Mitten Cuffs And Double Zipper, Infant Sleeper Onesie With Footed Play For Better Sleep
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