Only active thread about babies I see in PGen is Dragon's baby Togepi thread but the topic is entirely different than, 'your favorite baby Pokémon' haha. You should still be able to make that one since an active one doesn't exist ^^
I certainly love em but I can't handle any more clubs, far too busy lol. A thread on favorite baby Pokémon would certainly be a good replacement though ;3
Unfortunately only donators can add pictures for profile backgrounds. =( The lowest donator tier ($5) is enough to receive that ability, among other things.