I am ordering a B-Day gift for my cousin's son and he is age 4. What size shirt would a 4 year old boy wear?

I asked the cousin but did not get a reply and he is on a trip. I need to order the short now. He said size 4 but I just found stuff in infant size and then XS and S and M and L and XL.

So what size would and average 4 year old wear?
2 answers 2