I would love to see more activities unlocked for child Sims. The child stage is my least favorite because I feel like it's so limited--there are only 4 big goals they can accomplish, which is boring a...
I wish the devs would take a beat and re-invest in that life stage with as much gusto as they did toddlers. I think toddlers are the best thing they've done. They are unique and surprising and just fun/exhausting to deal with, much like their real-life counterparts. I would like to have that experience with the child stage as well. (Or rather every stage - I think elders are in need of an overhaul too!)