The main causes of crying during breastfeeding in newborns are due to the following conditions. First, it is caused by a serious lack of breast milk. If the child does not have enough breast milk, the child does not feel full, so the child cries a lot and the child is very hungry. In this case, the child appears to cry at the breast. For this situation, if the child’s breast milk is particularly insufficient, the child can be given infant formula feedings, which can prevent the child from developing malnutrition. Secondly, it is caused by pain in the abdomen while breastfeeding. This is because when the child is breastfeeding, it will reflexively cause a temporary acceleration of gastrointestinal peristalsis. After the child’s gastrointestinal peristalsis speeds up, it will pull the nerves in the child’s intestines, thus causing abdominal pain in the child. This condition is only temporary, and after the child has been breastfeeding for a while or after the child has stopped breastfeeding, the child’s crying and abdominal pain will disappear.