DD, 9 mo, has vomitted on 2 occasions after eating egg yolk. She has eaten it a handful (2-3) other times and did not get sick. Is this possibly an allergy to egg? I can't identify any other common thread of the two vomitting events. If this is an allergy, should I be taking extra precautions with introduction of other foods? There is no history of allergies in mine or my hubby's family--this is totally forgein to us.