Marshall from Dino Babies normally wears a powder blue blank diaper, but in some of Truman's stories, he wears different lower attire. In “Dak and the Beanstalk”, he wore these stupid looking blue pants. In one scene, Dak the pterodactyl, who was playing the giant, said he smelled a “Stinky little Dino Babe”, to which Marshall replied “It's not me”. And so, following this little encounter, Marshall had to go to the stream to wash off his pants. He wonders why he doesn't wear a diaper in some of the stories. You can watch this episode on youtube, I uploaded it.