My son is 6 years old and will be 7 in 3 months. He is 4ft 3in (average). He has a muscular physique. Son is all MEDIUM in his UA shirt/shorts/tracksuits with hopes/intentions to wear even more of skipping a size (wore UA very small before getting new clothes) but it was a big one , bold, solid no. They were very long (tops were worn on his bottom and shorts were above the knees). Additional tips: He can still wear his size xs UA Steps and UA Shorts and maybe even wear them for a year. until they start looking ridiculous If your child is 5 to 6 years old I would buy a youth XS, if your child is 6 years old, if they turn 7 I would buy a small one if your child is 8 years old , buy a medium. I hope it helps!
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