Replacement time of baby milk powder After the baby is born, in addition to breastfeeding, milk powder is a more common feeding method. As the baby grows, changing milk powder is essential, but how to change milk powder correctly? First, you need to understand the milk powder replacement time. Generally speaking, the baby\’s appetite and digestive function will change and need to be replaced accordingly at different points in time. During the newborn period, it is recommended to use newborn formula milk powder. You can try it around three months ago.