My baby's weight is only in the 13th percentile for her age. I bought Wednesday when it was 13.5 pounds. Luckily it hardly fitted her very tightly, but I think if she had weighed a pound or two more it would have been too small. Average weight is listed as 17-23 pounds so I would recommend going up maybe TWO sizes if they are at the top of the listed range. Despite not being true to size, this is a good swim diaper. She was 4 months old when we used her on vacation in Florida. She pooped while we were in the water with her and he held everything perfectly. the other leg and snap it at the side of the thigh. I like this style because it's easier than pull-ups.
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