A 1-year-old baby suddenly stops drinking milk may be due to physiological anorexia, zinc deficiency, indigestion and other reasons. 1. Physiological anorexia: Some babies will experience periods of anorexia, but their mental outlook as well as their development is good. As the baby grows, especially after adding complementary foods, as the baby can experience more flavors, the unchanged taste will make the baby refuse to drink milk, these are normal reactions. 2. Zinc deficiency: zinc deficiency can also lead to a 1-year-old baby suddenly refused to drink milk, a lot of babies have zinc deficiency, zinc deficiency will trigger the baby’s lack of appetite, so it will make the baby suddenly do not drink milk. 3. indigestion: baby indigestion will have diarrhea, bloating, constipation and other abnormal manifestations, will directly affect the baby’s appetite, thus making the baby reluctant to drink milk. 1 year old baby suddenly do not drink milk, should take the baby to the regular hospital in time to identify the cause of the disease, under the guidance of professional doctors targeted treatment.