We have been buying them in the following size for a number of years. They hold up VERY well. They are thick and of good quality. Very comfortable too (says my 4 year old). He is 40 inches tall and about 43 pounds. He will be 5 years old in July. Fat little guy. We bought the 5t and they are quite long but otherwise fit well. 4t would probably be ideal as he barely outgrew 3t but wanted to leave more room to grow. Hope this helps to find the right size.
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