Three-month-old babies occasionally cough twice if the appetite is good, good spirits, no fever and other symptoms, there is no relationship can continue to observe, may be a bit of gastroesophageal reflux or choking caused by coughing, to closely observe the changes in the condition. If the subsequent appearance of decreased appetite, fever or spirit is not usually good, easily irritable, sleep significantly more, usually to pay attention to viral or bacterial infections. Because the baby in March is too young, poor resistance, immature development of organ function, even the early upper respiratory tract infection is easy to spread to form the possibility of bronchopneumonia, early viral infection is also easy to secondary bacterial infection aggravate the condition.