2-year-old baby suddenly do not eat, often due to gastrointestinal diseases, oral diseases, improper diet and so on. 1. Gastrointestinal diseases: often accompanied by abdominal distension, abdominal pain, diarrhea, vomiting, fever and other symptoms, according to the severity of the symptoms and the specific cause of the diagnosis and treatment, you can give the baby a light and easy-to-digest diet, and increase the water intake. 2. Oral disease: often accompanied by oral ulcers, localized swelling, pain and discomfort, can be light and easy to digest diet, diet to avoid overheating. 3. Improper diet: the baby’s appetite is limited, if consuming too many snacks, may affect the appetite, do not want to eat meals, the need for scientific diet, appropriate to reduce the addition of meals. 2-year-old baby suddenly do not eat, there may also be other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.