Run slightly small, got the 18-24 m for my 16 month old and they fit perfect.

These slippers are very cute and soft. My son loves to wear them. They look great with his Tigger Halloween costume. The only issue we have encountered is that the tags (3 of them) are very big, but soft, inside each shoe. They bothered him so I just cut them out.

I bought these for my three month old baby along with the Tiger bodysuit and I am very pleased with my purchase. The shoes are cute, soft and most important they stay on the feet.I am planning to purchase the Mickey and Pooh infant shoes as well.:)