New Balance toddler boys water shoes size US 19,EU 26 equiv., to 9 toddler

New Balance little boys water shoes/sandals. Bright blue with yellow (navy mesh). Label states size US 19, UK 9,EU 26 They have a quick pull cord to tighten the shoes. Not sure how I ever knew what size exactly I was buying as I’ve never seen a US toddler size 19. According to New Balance this is equivalent to 9 toddler. They’re in excellent pre-owned condition,likely because he started walking in Crocs,now at 7 years refuses to wear any other shoe than Crocs. (Except when school policy didn’t allow Crocs) he agreed to wear See Kai Run pre-school and Adidas court side kindergarten up. Darn kids.