The following are some of the reasons why babies always cough in the middle of the night: 1. Food accumulation: Since babies are relatively small and have weak spleen and stomach functions, if parents add unreasonable supplementary food to their babies and often consume high-protein, high-fat food, it is easy to cause damage to the spleen and stomach and undigested diet over time, which can lead to food accumulation, heat and phlegm that can trigger cough symptoms. 2. Inhalation of cool air: If parents turn on the air conditioner before bedtime and set the 3. Cough variant asthma: Babies are allergic to substances in the indoor environment that can cause allergies in babies, so their respiratory tract is always in a highly reactive state. The baby’s cough is characterized by a strong cough at night, mostly dry and even accompanied by a little shortness of breath.