Actually, that's not been the case for me, Puffy.
If you were doing a quick collect from your babies, you may not have noticed that all the babies *don't* drop all of the decorations you listed earlier. Now that I have all 3 of the Valentine babies, they each drop the specific grouping of decorations I originally assumed they might drop from your list.
This info might help those players who can only get 1 baby before the event ends today or are interested in buying any of them from the market:
Direlove Piglet drops = Sweetheart Path, Sweetheart's Fence, Sweetheart's Pillar, Sweetheart's Gate
Lovebeast Pup drops = Wedding Path, Wedding Wall, Wedding Tower, Wedding Arch
Lovepea drops = Romantic Path, Serenade Wall, Serenade Tower, Lover's Gate
I'm not sure what "more" it's talking about on the back of their cards tho because so far, each baby has only dropped 1XP and a decoration for me (sometimes multiples of the same deco, like 2 walls or 3 paths)... but nothing "more".
LOL! ...no, sometimes just *YOU* need more, lol
Let us know if you hit the 99 cap on 'em before time's up!
I'm pretty sure you're the only one trying for it, lol.