Bacteria grows on food when it's between 5c and 60c, or multiplies rapidly then...so if food is properly handled, cooled quickly then it is ok to eat stuff cold..IF it was fully cooked prior. Of course if you want to be doubly sure then you can make sure you warm it to 70C or above and then cool it to where they can eat it. But if you are careful about it it's not going to give them food poisoning. I've never had it, the kids haven't had it and they've eaten stuff straight from the fridge cold before...but I'm really crazy about handling food properly. I have a knife and cutting board JUST for meats, I always make sure stuff is fully cooked through, they have never had anything but well done. But if your food was cooled quickly and you just warm it to where they want to eat it there shouldn't be a problem...but of course if you want to be more safe then by all means warm it more and then cool it for them. Just wanted to clarify after what I put and the responses following...I'm not chancing them food poisoning lol