Newborns stretching especially frequently may be caused by physiological factors such as positional discomfort, or pathologic factors such as vitamin D deficiency. 1. Physiological factors. Because the newborn is in a curled-up position in the uterus and in an extended position outside the uterus, he or she may experience postural discomfort, and therefore may stretch frequently. As the newborn maintains a movement for a long time, resulting in physical fatigue, which leads to the phenomenon of frequent stretching. 2. Pathological factors. It may be caused by vitamin D deficiency, intestinal flatulence, brain injury syndrome and other reasons. (1) Vitamin D deficiency: newborns with calcium deficiency and vitamin D deficiency may develop symptoms such as hand and foot twitching, rickets, and occipital baldness. This results in the symptoms mentioned above. (2) Intestinal flatulence. The newborn’s digestive system is not well developed. Newborns may swallow part of the air when they are in a hurry to eat milk, which may cause intestinal flatulence. Newborns will discharge flatulence and relieve abdominal distension by stretching frequently. (3) Brain damage syndrome. Due to abnormal pregnancy, premature labor and other reasons, causing brain injury syndrome, resulting in involuntary movements of the limbs, frequent stretching and other symptoms. Newborns stretching especially frequently, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.