The main reason single ingredient foods should be initially introduced to an infant is to:

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The main reason for introducing single ingredient foods to an infant is to determine if the infant has an allergic reaction to the food. This is important because infants are more susceptible to food allergies than adults and introducing multiple foods at once can make it difficult to identify the allergen. Once the infant has successfully tolerated a variety of single ingredient foods, then combination foods can be introduced.

The Main Reason Single Ingredient Foods Should Be Initially Introduced