I read many reviews to increase the size and I did. I should have stayed at their original/normal size. My 6 year old wears 6x and my 3 year old wears 3t (4t is too big). I bought size 6/7 and 3/4, the dresses are big as you can see in the photo. I didn't have time to exchange. But the clothes were comfortable and of good quality. My opinion on the quality of the H&M store (if it helps). The top is made of stretchy fabric. I love that it has a tulle lined jumpsuit that you don't want to wear and doesn't show through.
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