You know what would make great toys? baby pokemon ignore how past examples were largely ignored
I want baby Kangaskhan, pre-evo of Thoh and Sawk, pre-evo of Passimian and Oranguru, mechanical uselessnes and dex bloat be damned
Eh, by now I think it's too late for a baby Kangaskhan. The baby which a mother Kangaskhan carries is essentially a part of it now, especially with it's Mega Evolution going to the baby (giving the baby a small and temporary development boost). If Kangaskhan was going be be given a Baby, it would have been either Gen II when Baby Pokemon were introduced or Gen III when the generation cut happened.
As for baby for Thoh and Sawk, eh, would that maybe be too much like Tyrogue?
But let's pull back from specific examples and just focus on the topic of Baby Pokemon and them possibly making more. Baby Pokemon I feel have potential in two ways which GF had done to an extent:
1. Early access to certain species of Pokemon. While the initial intent is to breed for these Pokemon, Baby Pokemon are also a good chance to give players access to its evolution line earlier than it normally would. GF has done this, a few Baby Pokemon were available early in BW2 such as Riolu, Elekid, and Magby; Pichu, Munchlax, Happiney, Cleffa, and Bonsly in Sun & Moon.
2. Learning Moves their evolution can't. Baby Pokemon would also be a good excuse to give certain Pokemon moves they can't normally learn (and I don't mean as Egg Moves, I mean as level-up). Once again this has been done to an extent though I don't feel any of those moves have been good enough to make the wait to evolve/hatch a Baby Pokemon worth it.
Baby Pokemon have potential but I don't think GF had fully taken advantage of that potential. A Baby Pokemon should be made to serve a purpose, be it making that evolution family early to get or give that species a special move, instead of made on a whim and found some place to fit in.