Babies eating less may be due to improper feeding, lack of exercise or indigestion. 1. Improper feeding: In daily feeding, parents may have the situation of feeding too much sweet food. A large intake of sugar will cause the baby’s appetite to decrease, thus affecting eating. 2. Lack of exercise: Lack of exercise in the baby’s daily life can also lead to less eating. This is because lack of exercise can lead to a decrease in the baby’s digestive ability, resulting in a buildup of food in the stomach and intestines, making it less likely to produce hunger. 3. Indigestion: As babies are young, their gastrointestinal function is not well developed and they may suffer from indigestion. Indigestion can lead to a buildup of food in the gastrointestinal area, causing abdominal discomfort, bloating and other symptoms, thus affecting the baby’s appetite and leading to less food. Suddenly your baby eats less may also be due to other diseases.