NAN A2 Stage 1 is a premium starter infant formula that is nutritionally complete for healthy infants from birth. It is specially designed to ensure your formula fed infant receives balanced, high quality nutrition. NAN A2 Stage 1 infant formula contains a unique blend of whey and casein, where the A2 β-casein protein comes from milk of special cows, selected to exclusively contain the A2 β-casein protein. Backed by over 150 years of infant nutrition expertise, Nestle has helped to nurture generations of formula fed infants. Backed by over 150 years of infant nutrition expertise, Nestle has helped to nurture generations of formula fed infants.