A 4-year-old baby with a bad cough at night may have an upper respiratory infection caused by a cold, which can be treated with cough syrup or pediatric cough and phlegm granules. Coughing is one of the common symptoms of respiratory diseases. In addition to colds, bronchitis or throat inflammation can cause coughing. If it is not accompanied by fever, the condition is not very serious, but treatment is needed to control the condition. The throat is dry at night, so it can cause a bad cough, which should be checked and treated at the hospital. If your baby has a bad cough at night, parents can elevate the baby’s head to breathe smoothly to reduce coughing symptoms, and pat the baby’s back to promote coughing up phlegm. You should give your baby less spicy and stimulating food and drink more boiled water to prevent catching a cold. At the same time, strengthen your baby’s exercise to enhance physical fitness and improve immunity.