Newborns have been exerting force may be normal growth and development, defecation, intestinal discomfort, brain lesions and other causes of symptoms. 1. Growth and development: newborns have a strong metabolism, and during the growth and development process, they may stir their legs hard and hold their faces red, which makes parents feel that they have been exerting themselves hard. Observe that they have normal milk intake, normal urination and defecation, no vomiting and abdominal distension, no bruising, and normal weight gain, which is generally a physiological phenomenon and does not require special treatment. 2. Bowel movement: when newborns are defecating or urinating, it is normal for them to exert themselves all the time. 3. Intestinal discomfort: newborns do not pay attention to the warmth of the abdomen, the abdomen after the cold intestinal cramps, drinking milk crying, gas into the excessive abdominal distension caused by discomfort, newborns feel uncomfortable may also have been hard to force. 4. Brain lesions: newborns have congenital brain underdevelopment or brain hypoxia at birth, brain damage, there are abnormal nerve tingling, there may be a corneal reflex, showing that they have been exerting themselves vigorously. There are many reasons why newborns keep exerting themselves, and it is recommended to go to the hospital for treatment and therapy in serious cases.