Stage 2 6+ months At 6 months your baby's development progresses quickly and their need for Iron increases. SMA PRO Follow-on Milk is enriched with Iron to help support normal cognitive development in baby's brain. Development: Iron to help support normal cognitive development in baby's brain. Immunity: Vitamins A, C & D to help support the normal function of baby's immune system. Growth: Vitamin D and calcium to support the normal growth and development of bones. Omega 3 & 6† to help s