Baby Bear is a character from the children's television show Sesame Street. As his name suggests, he is based on the character of the same name from the story of Goldilocks and the Three Bears. He originally appeared as a generic bear in 1990 and became a regular character the following year, when he became best friends with Telly Monster.
Around the time that Baby Bear became a regular character, he was paired with Telly Monster, and the two became best friends. His parents, Papa Bear and Mama Bear (also inspired by their counterparts from the fairy tale), eventually appeared, and in 2003, his baby sister Curly Bear was born, turning the Three Bears into four.
Baby Bear speaks with a Elmer Fudd-esque speech impediment, in that he sometimes pronounces his Rs as Ws. For example, "Super Hero" is pronounced by Baby Bear as "Supo Hewo". (He appears to have the R/W speech impediment, but it is inconsistent, eg, he pronounces his sister's name Curly with the R, as well as Rs in non-stressed syllables and Rs at the end of sentences.)
In the 2002 special Elmo's World: Happy Holidays!, it was revealed that Baby Bear's family is Jewish. However, Baby Bear is seen participating happily in the Sesame Street Easter picnic in the 2007 book Rosita's Easter on Sesame Street; he brings Easter Braided Bread to the party.