1. When should the baby switch to milk powder? When should the baby switch to milk powder? Generally speaking, the baby can start to add complementary foods around 6 months after birth. At this time, you can also consider gradually converting breast milk or infant formula into ordinary formula. However, it should be noted that the baby\’s digestion is not perfect yet, so the transition to milk powder must be gradual and not all at once. 2. How to choose milk powder suitable for your baby. It is very important to choose milk powder suitable for your baby.