I've always known that Adidas tend to run about a 1/2 size larger than other sneaker brands---even for toddlers. My daughter is 21 months old and has a foot that's on the "smaller" side for her age and would ideally wear a size 4.5  IF toddler  sneakers came in half sizes. I found myself buying her size 4 in nike shoes, and they were just too small...size 5 was too big.  Same thing with Puma and other brands.

It was so frustrating because I knew I couldn't put her in a shoe that was too small yet, a shoe that was just a little too big would slide right off her foot (at the heel).

This adidas sneaker was PERFECT for her, in a size 4.  Size 4 in Adidas is really like a size 4.5....so, if your kid is in that "in between" stage, I'd say order the shoe in a 1/2 size DOWN. I think this is because adidas (even the shell tops) are so wide across the front.

I love that they are a durable material that you can simply wipe with a warm soapy water to get clean AND, they style is unisex---so, for boys or girls, it's a perfect casual shoe.