When to start mixed feeding your baby Mixed feeding refers to a combination of breastfeeding and formula feeding. When babies start mixed feeding is different for every family. Often, this depends on the mother\’s personal situation and her baby\’s needs. Generally speaking, after a baby is born, their body is still adjusting, and the mother\’s milk also needs time to settle and flow out naturally. During this period, if the breast milk is not enough or cannot be discharged in time, it is recommended to feed the baby