A one-year-old baby suddenly does not drink milk powder, may be caused by physiological factors, but also may be caused by oral diseases, indigestion and other pathological factors. 1. physiological factors: if a one-year-old baby suddenly do not drink milk powder, but eat other complementary food, it may be because the child is more interested in other complementary food, this time as long as the positive guidance, so that the child diet can be balanced. 2. Oral disease: when there are caries in the mouth, herpes stomatitis or oral mucosal ulcers, etc., the child drink milk easily lead to pain, and can be combined with fever, salivation and other symptoms. 3. indigestion: at this time the child is mostly accompanied by abdominal pain, bloating, decreased appetite, so suddenly do not drink milk powder. A one-year-old baby suddenly does not drink milk, there may be other reasons such as nutrient deficiencies, it is recommended to exclude the physiological factors, and then actively seek medical attention to find the cause, and if necessary, cooperate with the doctor’s treatment.