I originally bought 6 for my 4.5 year old. It's a bit big but not bulky at all (45 pounds). It felt a little short and the review I read said it got a little smaller after a few washes so I sent it back and got a 7. It's a little big but I wanted it to fit for more than 1 year. I can make 2 seasons out of it. In the summer it is also suitable for a light sweatshirt as it is not a heavy material. My son is always hot so a hoodie with a t-shirt underneath is perfect for him.
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