Yes, when starting something new you limit to one meal and you keep portions small (1-2 Tbs max). If you've got a kid who seems to be sensitive (as it appears you do), you should keep at the small portions for about 3 days before deciding to increase portion and adding another food. In my son's case his symptoms never appeared until Day 3, so we stayed on small portions for a week before starting something new. Yes, it took ages to get foods added to his list but before I instituted that rule I had a kid who was waking up a million times at night!