How much Benadryl should I give to a 9-month-old child weighing 17 lbs 14 oz for the prevention of a food allergy?

It is not recommended to give Benadryl to a 9-month-old child as a preventive measure for food allergies. Giving the medication preemptively can potentially cause side effects and mask a severe reaction. It is advised to introduce small amounts of food to the child gradually and have Benadryl on hand in case of a strong allergic reaction, such as a significant rash. If needed, a dose of 7 mg can be given to the child. Remember to check the concentration of the medication you have at home to administer the correct amount.