There is no clear age limit for colonoscopy, as long as the condition requires, physical fitness allows, children or infants can do colonoscopy. There is no age limit for colonoscopy, colonoscopy has several models, for infants and young children often use a thinner colonoscope, if the condition requires, children or infants and young children can undergo colonoscopy, and should be well prepared before the examination. For adults, colonoscopy for infants and young children is more complicated and difficult, and the indications should be strictly controlled. Children’s colonoscopy can be done painless or normal colonoscopy, usually children over 1 year old can do painless colonoscopy to reduce the pain. infants and young children under 1 year old are recommended to do normal colonoscopy due to the possible risk of anesthesia.