What is Wyeth Aerosol s26? Wyeth Aerosol s26 is a formula milk powder for infants and young children. It is developed and produced by Wyeth, a world-famous infant food manufacturer. Wyeth Ailero s26 three-stage pregnancy formula is tailor-made according to the needs of babies from 3 to 12 months old. It is a specially filtered protein blend that contains cow\’s milk proteins and partially hydrolyzed proteins to aid digestion and weight loss in your baby