The navel of a newborn is an area that is very susceptible to infection. If the navel is cut with an unsterilized instrument or daily hygiene is not ensured, the navel will be at high risk of infection and many other diseases. The period after the navel falls off in a newborn is a sensitive period, so it is necessary to clean the navel properly and pay attention to any unusual signs in the navel that warn of dangerous diseases.