Runs super big. I got my 10 year old the 10/12 which is the size I normally get it her and it was gaping at the arms. It was loose everywhere else on her as well. I like the tank, I have one so I got one for my girls because it’s super soft, it just runs really big. The 4/5 fit my other daughter who’s 3 and didn’t gape that much at the arms. Other than that, good shirt for summer.

Nice shirt, but be aware it has a built in bra - more likey made for a tween but an odd choice for the smaller sizes. My daughter is 4 and I got her the xs (4/5); not sure she is going to like that. You can't see it so it doesn't look weird but it seems weird to have a bra in small girls clothes.