How is it that a 20-day-old baby's navel is still protruding?

Patient's question:

Basic Information: Female, 1 month
Disease/Symptoms: Navel protrusion
Description of Condition: The baby is already 20 days old, but why is his navel still protruding and not retracted?

Doctor's answer:

This is normal. Since the baby is very young, the navel area may just be healing, so it is normal for the navel to protrude after healing. It does not indicate the occurrence of any disease. As the baby grows older, the navel will eventually into the abdomen. Avoid touching the navel frequently during daily care to prevent local infection. If there are any discomfort symptoms, it is necessary to visit the hospital for diagnosis and use medication accordingly.
Follow-up question: Why does the baby have blisters on the lips right after birth? This is difficult to determine the exact cause.