I'm ordering my 5 year old DD some dresses from H&M and am stuck on what size to get! She's has some in 2-4Y that fit ok but are getting short and I want to make sure she gets plenty of wear out of them but I don't know if the 4-6Y will be too big... she wears a 4T at Carters and Cat and Jack and is about 33 pounds and 39-40 inches tall.