Suddenly, I'm remembering a couple of babysitting related episodes, I believe both are from Season 31 (I don't know, the latter may actually be 32, I'd have to look at Muppet Wiki).
The first of which I seem to recall involving Big Bird was wanting to have a playdate with Maria, but she was too busy having to suddenly babysit a baby bird, which makes Big Bird jealous because Maria's giving more attention to the baby bird than him, but he suddenly feels useful when she asks him for help when it comes to grooming the baby bird.
The second of which is also Maria babysitting, this time she and Gabi are babysitting Natasha, and Natasha keeps crying out "Hoongie", which Maria and Gabi can't seem to understand what she means, thinking she means things like she's hungry and such; finally towards the end of the story, Ingrid returns and reveals "Hoongie" is her favorite dolly that they forgot to leave with her.