My slim and tall 3 year old fits perfectly in size XS. I wasn't sure what size XS was so I took a chance as soon as I got the shorts (I bought two packs, came out at $7 for a pair) when I got the shorts the label says that they have a size 4-5 but only fits my son well. Room to grow from now through summer. A drawstring is also tied so it can be tightened around the waist.
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