Sometimes a medical professional will recommend supplementation. Most of the time, though, a professional will recommend breastfeeding exclusively, but supplementation may be best or necessary when: • A newborn has lost body weight early in their life • A newborn gains weight too slowly early in life • A baby is having too few wet diapers during the day • A baby is very fussy and isn’t satisfied after feeding It’s important to introduce the formula properly, which means getting professional advice about it. Your body has to adjust to supplementation, and so will your child’s body. These adjustments are typically pretty easy, but there may be complications. Keep reading to learn more.