Nestle NAN OPTIPRO Stage 3 Infant Milk Formula is a growing up milk designed for toddlers from 1 to 3 years of age. OPTIPRO An optimized protein blend that supplies the right amount and quality of proteins needed for your baby""s growth. Bifidus BL: Naturally active probiotics. Lipid Smart: A special fat blend which contributed to your baby""s normal brain development.