In the Netflix show "Puss in Boots" called "Small change" there is a a forest of fountains (cant remember the name) as seen in the episode "Fountains" which is home of magical fountains each with the power to turn whoever drinks it into something or force them to do something (including fountain of youth) which wears off when they say "Release" (once they drink from a specific fountain and say release. they cannot drink from that fountain again).
In the episode Small Change Puss and gang return to seek information. But after an incident Puss falls into the fountain of 100 changes. Where everytime he hiccups he endures one of a 100 different effects. "Release" wont work as he must go through each one which includes (turn into a bird, walk on hands, speak backwards, etc)
At one point he becomes a kitten...although could be just a regular cat (all he says in "Mew" before hiccupping again). But there is 100% ar at the end of the episode. As he hiccups and becomes a kid. I know this for a fact as in "Fountains" he drank from FOY and temporarily got younger with his hat large on him and a squeaky voice. In the episode its the exact same thing. But its for a few seconds as he hiccups off screen to close out episode