Generally speaking, preterm babies can be switched to regular formula after 6 to 7 weeks after birth, but every preterm baby is different, so the exact situation needs to be judged according to the baby’s condition. If the week of gestation is below 37 weeks for delivery, it is called preterm baby. Generally preterm babies have low immunity and are susceptible to bacterial infections, as well as poor nutritional development. Normally, if the mother has enough breast milk, there is no need to add extra formula; breast milk is the best nutrient to help increase the immunity of premature babies. If the mother does not have breast milk, then you need to use milk powder, preterm babies can use milk powder rich in immune factors, can help preterm babies increase nutrition, resistance to external environmental germs. Generally speaking, if the child’s growth and development is checked to reach the normal growth standard after 6 to 7 weeks after the birth of the premature baby, it is usually possible to switch to normal milk powder at this time. It should also be noted that the specific feeding needs to be carried out according to the child’s needs, and if the child is not feeling well, it is recommended to consult a doctor in time.