3 year old baby cough does not want to eat, may be due to bronchitis or pneumonia. 1. Bronchitis: bronchitis is more likely to infect babies around 3 years old, mainly due to inflammation of the bronchial tubes are infected, resulting in shortness of breath, coughing and other symptoms of the baby, while there will be a decrease in appetite, resulting in the baby coughing and not eating. 2. Pneumonia: usually due to bacterial or viral infection of the lungs, pathogenic bacteria lung mucosa inflammatory reaction, the baby usually appear high fever, cough and other manifestations, due to elevated body temperature affects the digestive function, so it will cause a decrease in the baby’s appetite, the baby cough does not eat the situation. 3-year-old baby cough does not want to eat, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.