There are definite flames shooting and onion volcanos.
You'll be seated with other people and this is a show (the cook will be talking and explaining things as he or she goes), so if one of the little one's starts crying, you may be in a difficult position- to be polite, you'd probably have to leave the room with them to not disturb the other guests, and that might mean missing the show (and your meal is definitely designed to be eaten hot- it'll cool quick). Because of the seating with other people and the show like atmosphere, I'm not sure it's the best place for toddlers- the flames flying around scared me when I was much older then toddler age, I know.
But I'm sure many people have brought kids that young to the restaurant and will continue to do so, so don't let me worry you too much.