Too much exposure to the baby's genitals can easily cause external bacteria and pathogens to invade the body through the delicate vaginal mucosa and skin, making the baby sick. When boys are young, they usually have too long foreskin, which is easy to accumulate dirt. If they contact with unclean external environment, such as adults' hands and faces, they are more likely to cause infection. Chickens are one of the weakest parts of the baby's body, and are also the most vulnerable parts. The collision, bumping, stabbing, pinching, scalding, rubbing, etc. of external objects will hurt. The bites of mosquitoes and the scratches and bites of some pets, such as cats and dogs, will affect health and even cause lifelong disability. [ detailed ]