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Infants and Egg Allergies. Since egg allergies can create dangerous symptoms in kids, many pediatricians do not recommend serving egg whites until the baby is older than one year. Since the egg white contains allergenic components, yolks generally tend to be safer. Your pediatrician will recommend a good time to introduce egg whites.
Egg whites can trigger allergies in children but not egg yolks, hence if you want to start eggs for your 9 month old baby, first start with a teaspoon of well cooked yolk and then after checking for allergies, progress further with the whole egg.