If a baby frequently coughs when exercising, it is often due to improper exercise, and may also be related to respiratory and heart diseases. Parents should take their babies for relevant examinations to clarify the cause and then carry out targeted treatment to avoid damage to the baby’s body. 1. Inappropriate exercise: If the baby usually exercises less and moves inappropriately during exercise, such as breathing with the mouth open during exercise, water loss in the throat may occur after prolonged exercise and may cause reflex coughing. 2. Respiratory diseases: Some babies have respiratory diseases, such as acute bronchitis and bronchopneumonia, the trachea will be stimulated during exercise and coughing will occur after an increase in phlegm. If asthma is present, it can also be triggered by exercise and coughing can occur. 3. heart diseases: such as congenital heart diseases and myocarditis, etc., can lead to insufficient blood supply to the lungs during exercise and contraction and spasm of the capillaries in the baby’s lungs, which can also trigger a coughing reflex. 4. other: if the baby’s exercise environment is not good, such as the presence of more dust or the air is too cold, an exercise cough can also occur. This condition usually disappears naturally after changing the exercise environment. In addition, if your baby has a cough after exercise by chance in daily life, you can increase the amount of exercise or improve the way you exercise, and the cough may be relieved.