I bought a size 4 for my son who will be 5 next month. He is 43 pounds and 43 inches tall. His legs and arms are too long and I have to roll them up. However, it seems ok without losing the function of the wetsuit. It's nice and thick and it's a super bargain for the price! My daughter, who will be 7 in 2 months, also fits a size 4 suit and the length suits her much better. She also weighs 43 pounds but is 48 inches tall. I hope this information helps with sizing questions.
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