Love this swimsuit for my 4 month old granddaughter. I bought and received size 6 months and it fits comfortably. I believe she is about 24.5 inches long and weighs 15 pounds. Hope this helps with sizing. I also thought that a little more is good. It is more comfortable and you can roll up the sleeves and legs at any time. I've seen pictures of her in it and nothing rolls up. I recommend, my very picky daughter is very happy with this gift!
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