The sudden drop in milk supply may be due to physiological anorexia, or it may be due to colds, intestinal obstruction and other diseases. 1. Physiological anorexia: the baby physiological anorexia will appear in the case of a sudden decline in milk. Physiological anorexia often occurs when the baby is 4 months to 5 months old, when the baby does not have other symptoms, parents often do not need to worry too much. 2. Pathological milk drop: colds, intestinal obstruction and other diseases can lead to a sudden drop in the baby’s milk, mainly due to pathological conditions of the child’s appetite, digestive function, there will be a sudden decrease in milk. When the baby’s milk volume suddenly decreases, parents need to pay attention, closely observe the baby’s mental state and other conditions, and if necessary, go to the hospital in a timely manner, and under the guidance of the doctor to deal with.