I ordered a size up because of the reviews, but then had to return it for a smaller size.
I've attached a picture of the size chart on the box.
My 11month old baby girl is in the 95th percentiles, she's big. But size 5 (12-18mo) was too long. Size 4 (9-12mo) fits perfectly. I need it to fit perfectly for her first birthday party.
I deducted a star because yet, the shoe is slightly narrow, and I wish it was a bit roomier width wise. It is really cute though. The material has shimmer in it (not glitter) if you look closely. Our shoes came with a few tiny dark imperfections, but nothing major or too noticeable. I love the style.