Hypoallergenic Starter Infant Formula Based on Cow's Milk for Infants at Risk of Allergy - Fortified with Iron, Hypoallergenic starter infant formula is designed for infants from birth to 6 months, at risk of developing an allergy (e.g. if another family member is allergic). However, if your baby already has a declared allergy to cow's milk protein, do not use NAN H.A. 1 without asking your doctor. The introduction of any other formula, or cow's milk, must only be carried out under medical supervision.