Baby Bunsen appeared semi-regularly throughout the run of Muppet Babies as a baby version of Bunsen Honeydew. He was accompanied by Baby Beaker. However, he and Beaker appeared in the opening sequence to every episode. Bunsen usually arrived to introduce his latest invention.
- Episode 102: Who's Afraid of the Big, Bad Dark?
- Episode 105: Scooter's Hidden Talent (appeared near the end)
- Episode 106: The Case of the Missing Chicken (fantasy sequence only)
- Episode 107: Eight Take-Away One Equals Panic (appeared very briefly on a plane in a Go Bye-Bye segment)
- Episode 109: Close Encounters of the Frog Kind (fantasy sequence only)
- Episode 113: Good Clean Fun
- Episode 201: Once Upon an Egg Timer
- Episode 206: Snow White and the Seven Muppets
- Episode 207: I Want My Muppet TV!
- Episode 208: Musical Muppets
- Episode 211: The Muppet Museum of Art (non-speaking appearance in fantasy sequence)
- Episode 212: By the Book (fantasy sequence only)
- Episode 301: Pigerella (fantasy sequence only)
- Episode 305: The Muppet Broadcasting Company
- Episode 401: Muppetland (non-speaking cameo in music sequence)
- Episode 404: Where No Muppet Has Gone Before
- Episode 414: Old MacKermit Had a Farm
- Episode 712: Remote Control Cornballs