My son sleeps in these knit shorts and tank tops instead of regular pajamas so he has plenty of them. I have compared these sizes to all of his other knit shorts and they are about the same size but up to 5T. So it all depends on the size of your baby. Size XS for 3-4 years: waistband is 10" wide at top when flat and 13.5" long so cut longer. Hope that helps!
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