Infants crying at night always want to eat milk may be due to physiological phenomena, improper feeding and other non-pathological reasons, but also consider is due to gastrointestinal dysfunction and other pathological reasons. 1. Physiological phenomenon: the baby cerebral cortex excitability is high, easy to not sleep all the time crying and has been the phenomenon of breastfeeding, but as long as the baby’s state is good, growth and development is normal, it is a normal phenomenon. 2. Improper feeding: If the infant swallows less milk due to incorrect feeding posture, or if the infant is not full due to the mother’s lack of milk and difficulty in sucking, the infant may not be able to eat enough, which may lead to the phenomenon of the infant not sleeping and crying all the time and still breastfeeding. 3. gastrointestinal dysfunction: when the baby has gastrointestinal dysfunction, it is easy to lead to abdominal pain, abdominal distension and other uncomfortable symptoms, especially eat a little milk will trigger abdominal pain, the baby will not eat because it is not saturated with pain, resulting in the emergence of the phenomenon of not sleeping and always crying but also keep eating milk. Therefore, the causes of babies do not sleep and always crying and always breastfeeding more reasons, it is best to identify the different causes in time, timely treatment, to avoid affecting the growth and development of infants.