My granddaughter is 2 years old, she is very thin and tiny for her age. I thought the SM 4/6 swimsuit was too big for her but it fit her body perfectly but was a bit longer. Since she wears diapers, the bathing suit fits very well. If she were 4 years old, if she wasn't a very, very little 4 year old girl, this wouldn't be the best choice for her.
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