One year and eight months old baby suddenly eat less may be physiological factors, oral lesions, gastrointestinal lesions and other factors. 1. physiological factors: a year old eight months baby ate a lot of snacks, in the meal will suddenly eat less, parents control the baby’s snacks, the child’s meal will return to normal. 2. Oral lesions: when the child has some oral lesions or pharyngeal lesions, such as oral ulcers, herpes, pharyngitis, etc., it may cause painful symptoms during meals, and will eat very little, which may also be accompanied by sore throat, fever, malaise and other symptoms. 3. Gastrointestinal lesions: babies consume a lot of indigestible as well as greasy food, may lead to gastrointestinal system digestive abnormalities, caused by indigestion, will eat eat less, may be accompanied by bloating, nausea and vomiting and other symptoms. If a one-year-old eight-month-old baby suddenly eats less and for a longer period of time, accompanied by other abnormal manifestations, parents should promptly take their children to the doctor for examination and treatment.