My kids are 2 1/2 years old and 3 1/2 years old (tall!). I made the size 2-3 first and just tried it on both of them to see who it fit best. The size 2-3 fit my 2 year old perfectly and was definitely too short for my 3 year old. So, I went ahead and made a size 4 for the older one, so there would be some growing room.
This romper is pretty adjustable in my opinion since it's a halter top - you can pull it tighter or looser depending on how you need it to fit.
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