The Baby Dinosaur is a young Triceratops who was stuck between two rocks. He was stuck and the Wonder Pets came to rescue him. They tried to pull him out and tried to push him out, but they failed. Then a pterosaur landed on a rock that was about to fall on the dinosaur. The pets then decided to squirt him with mud and gently slide him free. It worked and they got him free just before the huge rock fell. The baby triceratops then allowed the Wonder Pets to ride on his back. He is then reunited with his daddy triceratops. The triceratops call sounds just like a trumpet. He lives with his dad and lots of other dinosaurs. He was last seen with his dad feasting on humongous sized prehistoric celery.