Baby’s exertion may be caused by normal growth and development, urination and defecation, intestinal flatulence and other reasons. 1. Normal growth and development: the baby was born shortly after the cerebral cortex development is incomplete, the sympathetic nervous system is excited, every day in the rapid growth and development, may appear to exert force, chewing and other strange movements, is a normal phenomenon do not worry. 2. urination and defecation: some babies drink too little water, urination and defecation will be hard to force or even suffocate the little face red. Parents can feed more water to the baby to help relieve. 3. Intestinal flatulence: the baby swallowed a lot of air when eating milk, indigestion caused by intestinal intolerance, resulting in intestinal accumulation of gas is too much, the baby will increase abdominal pressure by exerting force, discharge excess gas, relieve intestinal flatulence. If the baby’s exertion lasts for a longer period of time, the baby should be taken to the hospital for examination, and the diagnosis and improvement should be clarified under the guidance of the doctor.