Many parents both breastfeed and formula feed at the same time. It’s called supplementing, and it’s perfectly okay to do this. Sometimes it may be necessary to supplement, such as when a mother has a low amount of breast milk, while other times it might just be more convenient to supplement. Either way, it’s perfectly okay. There may even be medical reasons for supplementing. However, it’s worth noting that the American Academy of Pediatrics (AAP) and the World Health Organization (WHO) recommend breastfeeding exclusively for the first four to six months of a child’s life. According to the AAP and WHO, after these first months, breastfeeding should be continued while solid food is introduced. However, the organizations don’t advise against formula feeding/supplementation during this time.