Probably you won't be ready to expand the game for a while.  But when you do, I'd love to see a solitaire card game that could be played to make a baby grow up faster, a captured pet be tamed faster, or a pet regain energy faster.

Or, an activity that can only be done with babies would be great, since they can't explore.

Sorry, we're not going to add any mini-games that are out of the world and game concept. There's no logic in gaining energy or faster growth for playing solitaire. I don't see any explanation how it may work even for pure fantasy, and we have sci-fi back and some scientific-like ground for every aspect of the game.