Baby Bear originally appeared as a generic bear on Sesame Street in the late 1980s. He made his first appearance as Baby Bear in a 1991 episode, hiding from his nemesis Goldilocks, who kept annoying him.
Around the time that Baby Bear became a regular character, he was paired with Telly Monster, and the two became best friends. Later, his parents, Papa Bear and Mama Bear, were introduced on the show. In 2003, his baby sister Curly Bear was born, turning the Three Bears into four. He likes to eat porridge.
In Season 31, Baby Bear created an imaginary friend, Hero Guy.