The baby cries after breastfeeding, may be related to insufficient breast milk, may also be due to indigestion, milk protein allergy and other reasons caused. 1. Insufficient breast milk: If the baby for breastfeeding, and the mother of the milk secretion is insufficient, resulting in the baby sucking on the nipple, did not drink enough milk, resulting in the stomach is not full, is still in a state of hunger, it may show after eating milk crying. 2. indigestion: due to the smaller baby gastrointestinal function development is not yet perfect, the gastrointestinal tract of the digestive ability is relatively poor, if not fed properly, it is easy to cause the baby indigestion. In the case of indigestion to eat milk, easy to cause after eating milk abdominal distension and pain symptoms increased, thus causing the phenomenon of crying. 3. Milk protein allergy: some babies have milk protein allergy, easy to cause milk protein allergy after eating milk, resulting in abdominal pain, there will be crying phenomenon, severe cases may also be accompanied by diarrhea, vomiting and other symptoms. Baby crying after eating milk, may also be caused by other reasons, exclude physiological factors, it is recommended to consult a doctor as soon as possible, after diagnosis of the causative factors, to give targeted treatment.