Four-month-old babies dry heaving is usually due to external stimulation of the throat and other physiological factors, and respiratory tract infections, gastrointestinal diseases and other pathological factors. 1. Physiological factors: four months baby dry heaving may be because the baby eat hand or breastfeeding pacifier and so on to extend too deep, resulting in irritation to the throat and dry heaving. 2. Pathological factors: respiratory tract infections caused by localized inflammation of the respiratory tract and phlegm stimulation can also lead to four-month-old babies with dry heaves. Gastroenteritis due to infections and other conditions may also cause dry heaving in four-month-old babies. Four-month-old babies dry heaving, there may also be other reasons, it is recommended to go to the hospital in time, complete the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.