Nestle Nan Optipro 2 Cow Milk Based Follow-up Milk Formula 6-12 Months is a follow-up infant formula intended for infants beginning in the sixth month as the liquid component of their diet during and after weaning. In addition to other foods, it should not be used as a substitute for breast milk during the first six months of life. It is composed of blended protein that is varied in quantity and quality. Nutrition is crucial during your baby's first year of life. NAN OPTIPRO 2 Milk Powder is designed to ensure that your formula-fed infant obtains balanced, high-quality nourishment starting at 6 months of age.