As long as they were properly refrigerated, then yes, should be absolutely fine. My rule was always, if I would eat it, my daughter could eat it. If something was left out on the counter unrefrigerated overnight, I wouldn't eat it. Or if it sat in the fridge for 3 days, I wouldn't eat it. But reheated leftovers that were properly stored, I would eat, and so could she. A stomach bug from improperly stored food is the same for everyone. If you wouldn't get one from something, she won't get one either. So yes, leftovers are perfectly fine and that's usually what my daughter had up until she was about 1.5 because she ate dinner earlier than we did because she went to bed so much earlier. I usually just try to use anything up within about 48 hours.