1. Reasons for infants and young children to switch to milk powder. Breast milk is the best food after the baby is born. However, some mothers are unable to breastfeed due to various reasons and can only choose to feed with milk powder. In addition, as the baby grows, there will also be situations where the milk powder needs to be replaced. These situations include: 1. The baby grows older and needs more nutrition; 2. The baby develops allergic reactions; 3. A certain milk powder formula is not suitable for the baby. 2. How to choose the appropriate milk powder 1. Understand the milk powder formulas at different stages: 0-6 months for newborn infants, 6-12 months for older infants, and 12 months and above for toddlers.