My son usually wears clothes for 18-24 months but I ordered these from 3T as other reviews said it runs small. It should fit snugly, but it definitely won't fit at 3 years old. Now it fits him a little looser and he can grow with him. Overall I like it very much, just order one size larger than usual. After all, children only grow, and if they are too big now, in time they will fit.
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