
I bought a size 8 for my eight year old and a size 4 for my four year old. My eight year old daughter is 55 lbs and 51" tall. She is very thin. Her wetsuit fit her quite well. My four year old is 35 lbs and 42" tall. Her suit is a good six inches too long in the legs. I was able to fold them up and she didn't mind. The arms are a few inches too long, but are not wide enough to roll, so I kind of pushed them up. The suits kept them warm while they swam in an 82 degree pool.

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