I have bought this brand underwear for my toddler since we started potty training. Every style we've bought: (Phineas & Ferb, Spongebob, Pixar Toy Story, Diego, Angry Birds) they have a great assortment of fun pictures that he enjoys, and stay bright and fun even after a lot of washing.

He is 3.5 years old, only 50% height and 50% weight, so not very big... But I have always had to go 1 to 2 sizes bigger in this brand for underwear. Otherwise, they are too tight and uncomfortable, so I really recommend going up a size (or 2!).