Lilo & Stitch
Cartoon Series: Season 01; Episode #35: “Baby-fier” [Experiment #151] (Monday, January 12, 2004)
Lilo is grumpy because Nani says she’s too young to go to a scary movie. So when she and Stitch catch an experiment that turns adults into babies, Lilo is thrilled. But she quickly learns that being the “responsible adult” in the family is tough work, and wants nothing more than to return everyone to their proper age.
Recipe to turn babies back into adults: 1 cup of milk, 3 mashed bananas, 1 teaspoon of applesauce, 1 dollop of 100% Kona Coffee
Stitch! Best Friends Forever (Stitch! Zutto Saiko no Tomodachi)
Anime Cartoon Series: Season 03; #29: "The Greatest Crisis Ever!" (12/01/2008)
Aliens into babies
Cartoon Season 01: Episode: #07 "Stitch Becomes a Mama" (11/12/2008)
Stitch is with a new girl on another island. In the 7th episode of season 2 called "Rivals Stuck Together", Hamstel (the villain) tries to make them evil again. During the episode, Babyfier (has the power to make people and animals and experiments and aliens into babies) wreaks havoc, turning some students, teachers and others into babies, and leaving Stitch to worry about it.