7-month-old babies suddenly do not drink milk may be caused by adding too much supplemental food, but also may be caused by gastroenteritis, dyspepsia and other diseases, as well as other diseases such as mouth ulcers. 1. too much supplemental food: if parents add too much supplemental food to the 7-month-old baby, it may lead to the child eating too much, already full, and thus suddenly do not drink milk phenomenon. 2. Gastroenteritis: Gastroenteritis is mainly due to bacterial, viral and other pathogenic infections, as well as stress, medication and other factors, the main symptoms of children with diarrhea, epigastric pain, abdominal distension, loss of appetite and so on. In addition, children with gastroenteritis will also experience nausea, vomiting, acid reflux and other symptoms. 3. Dyspepsia: Dyspepsia can be caused by a variety of factors, including gastrointestinal dyskinesia and visceral hypersensitivity. Children with dyspepsia will have symptoms such as postprandial fullness, early satiety, and mid-upper abdominal pain, which can lead to the baby’s sudden refusal to drink milk. 4. other: anorexia nervosa, oral ulcers, hepatitis and other diseases can also lead to 7 months baby suddenly do not drink milk phenomenon. When a 7-month-old baby suddenly does not drink milk, it may be a normal phenomenon caused by too much complementary feeding, and does not need special treatment. If it is caused by a disease, parents should take the child to the doctor in time and follow the doctor’s instructions for treatment.