The CE meal is likely to be cold meat or something like tofu for the veg option, plus a starter, chocolate pudding and a roll with butter.
My experience is that the cold meat usually goes down ok, starter/tofu no chance, chocolate pudding doesn't touch the sides, fill up with the bun. Anyway I wouldn't stress too much about getting a child meal as it's likely to be similar or not particularly good. There are usually biscuits available to snack on too.