Disclosed are methods for improving memory and/or cognition in an infant by administering soy protein to the infant's mother during pregnancy, and further administering soy protein to the infant after delivery. The soy protein may be administered to the infant's mother during lactation if the infant is breastfed and/or may be directly administered, for example, by administering the infant an infant and/or nutritional formula comprising soy protein. Also disclosed are compositions comprising soy protein that may be used in the methods.