NAN A2 Stage 2 is a premium follow-on formula that is specially designed to ensure your formula fed infant receives balanced, high quality nutrition from 6 months of age. NAN A2 Stage 2 follow-on 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 155 years of infant nutrition expertise, Nestlé has helped to nurture generations of formula fed infants.