Muppet Babies (cartoon), CBS
IMDb; Muppet Wiki; Retro Junk; TV.com; TV Tropes; Wikipedia
There was a sort of fantasy flashback scene in "Muppets Take Manhattan" (see Muppet movies) with some of the Muppets... maybe just Kermit and Piggy, I forget... as babies together. Which of course they never really were. But in this Saturday morning cartoon, many of the Muppets stayed together in a nursery, as babies, where they were cared for by Nanny. And they had lots of imaginary adventures and stuff. Also Robin came to visit sometimes when he was a tadpole in a fish bowl. That was weird. Okay, the whole show was weird. Muppets are weird. That's what's so great about them. Right? Wish I could think what else to say.