Four-month-old babies do not drink milk powder, parents can carry on the breastfeeding way, or change the type of milk powder appropriately, as well as choose different feeding methods, etc., so that the baby gradually accepts milk powder. If the four-month-old baby has always belonged to the breastfeeding way, when adding milk powder, due to the taste of milk powder and breast milk is not the same, the baby will be difficult to accept. Parents should not force their babies to accept formula milk, but should take a step-by-step approach to make their babies accept formula milk. You can continue breastfeeding and gradually increase the intake of formula milk. Parents can try to change the type of formula and choose one that is acceptable to the baby. If the size of the nipple is small, the baby may be reluctant to drink formula due to difficulty in sucking, and can be replaced with a nipple of a larger size. Or choose different feeding methods, such as spoon feeding and cup feeding. Four-month-old babies can also add complementary foods appropriately, such as fruit juice or rice pudding. If a four-month-old baby cries or develops skin allergies while drinking formula, parents should pay attention and bring the child to a regular hospital.