Nodding respiration of newborns after breastfeeding is firstly considered to be caused by physiological factors, such as too fast and too rapid breastfeeding without timely hiccups; and secondly, it is considered to be caused by pathologic factors, such as lung infections and so on. 1. Physiological factors: Because the gastrointestinal tract of newborns is not yet well developed, if the milk is eaten too fast and too quickly, it is easy to cause air to enter the stomach, and there is no timely burping after eating milk, which will easily lead to the appearance of the above symptoms, accompanied by spitting up discomfort. 2. Pathological factors: lung infection: due to the weaker immunity of newborns, when stimulated by cold, it is easy to lead to lung infection symptoms, showing the above discomfort. Nodding respiration after breastfeeding may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.