Following what other people said as well as my experience with pajamas, I got the following size. He sits well in them, his legs are only slightly baggy, but that's not a problem as the cuffs at the ankles prevent him from stumbling while walking and running. After washing, we put it in the sun for an hour, and at night the tyrannosaurus glows very brightly. My son loved it and wanted to wear it every night.
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