Dry heaving can be caused by improper feeding, gastroenteritis, respiratory tract infections and other reasons. 1. Improper feeding: If the baby inhales too much air while eating, or eats too much, resulting in indigestion, it may cause the baby to always have dry heaving. 2. Gastroenteritis: Babies have low resistance, if the food they eat is not clean, it can cause viral and bacterial infections, which can affect the function of the gastrointestinal tract and lead to the symptoms of dry heaving all the time. 3. Respiratory tract infection: if the weather temperature difference is large, parents do not do a good job for the baby warm measures, the baby can appear cough, cough phlegm and other symptoms, respiratory tract inflammation repeated stimulation, may lead to the baby always appear dry heaving symptoms. The baby always appear dry heaving, may also be other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or standardized treatment.