If the newborn baby's navel protrudes, it may be caused by umbilical hernia. Umbilical hernia refers to the abdominal wall muscle is not completely closed, resulting in abdominal organs (such as intestines) protruding through this gap.

Here are some ways to deal with it:

1. Observation: For mild umbilical hernia, there is usually no need for treatment, just closely observe the baby's condition. If the hernia sac does not retract itself or has symptoms such as pain and vomiting, you should seek medical attention in time.

2. Avoid overexertion: Avoid wearing tight clothes or using too tight diapers for your baby, so as not to aggravate the symptoms of umbilical hernia.

3. Keep it clean and dry: Wash your baby's navel with warm water and soap every day and keep it dry. You can wipe it gently with a cotton ball, but don't rub it hard.

4. Surgical treatment: For severe umbilical hernia, surgical treatment may be needed. Surgery is usually performed within a few weeks after the baby is born to avoid complications.

In short, if you find your baby's navel protruding, you should consult a doctor in time and treat it according to the doctor's advice.