54 days baby milk volume reduction may be physiological anorexia, milk powder does not fit the appetite, gastrointestinal discomfort, zinc deficiency, oral diseases and other causes. 1. physiological anorexia: 54 days of the baby’s physiological development and sensory maturity, the surrounding environment to produce a clear curiosity, when eating milk distraction, there may be physiological anorexia, so that the baby’s milk volume decreased. 2. milk powder does not fit the appetite: 54 days of the baby has to replace the other brand of milk powder, drink the milk powder does not fit the appetite, will also appear the phenomenon of milk volume reduction. 3. Gastrointestinal discomfort: 54-day-old babies with gastrointestinal dysfunction, indigestion, intestinal colic and other diseases, drinking milk can not be digested and absorbed, bloating, abdominal pain and other discomforts, which will lead to a decrease in appetite, the amount of milk to drink. 4. Zinc deficiency: 54-day-old babies are deficient in zinc, causing abnormal secretion of digestive enzymes, loss of appetite will reduce the amount of milk drunk. 5. Oral disease: 54-day-old babies usually do not pay attention to oral hygiene may be triggered by thrush, thrush is caused by Candida albicans infection, the baby due to the pain and discomfort and reluctance to eat, but also the phenomenon of drinking less milk. There are more reasons for 54-day-old babies to have less milk, and it is recommended to go to the hospital for examination and treatment in time if it is serious.