I bought 2/3 for my 2.5 year old son and they run a little small. The length is ok but the waistband is a bit tight and my son is medium height for his age. We have OshKosh 2/3 underwear for him and these Hanes are MUCH smaller. They definitely shrink too, so keep that in mind. Not sure how much we will need of them as they are already a bit tight around the waist but I think they will fit for now.
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