Generally, the following steps are used to perform CT on infants: first put the infant to sleep or apply sedative drugs for hypnosis, because infants often cannot cooperate and head movement during CT often affects the CT imaging and subsequently makes the doctor’s judgment inaccurate, so the infant should be put to sleep or apply sedative drugs such as chloral hydrate before CT is performed. The process of operating underneath the CT machine is very quick, usually about 5-10 minutes, and the infant CT is mainly to determine whether there are abnormalities in the lungs, skull and other parts of the child’s structure.