Very important. My son is thinner but he is tall for a 4 year old. They are tight on the body, but it is comfortable for him. i love all colors For reference, my son is 32 pounds, long torso. They will definitely fit tighter with a heavier baby. But they are soft and stretchy. Would buy again. Then I dyed them and tumble dried them on a low heat, they won't shrink yet, barely in the first wash if ever. Wash well once a week
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