Umbilical Hernia

Umbilical hernias are swollen bumps that appear when part of your intestines stick out through your abdominal muscles near your navel. If your baby has a bulge around the
bellybutton, they may have an umbilical hernia.

Before the umbilical cord falls off, you may notice that the area seems to stick out a little more when the baby cries. Or maybe, once the cord is gone, you see that their navel sticks out
(an “outie,” as it’s commonly called). In some cases, even if you can’t see a bulge, you might be able to feel one.

https://www.webmd.com/parenting/baby/what-are-umbilical-hernias#1

Inguinal Hernia in Children

What is an inguinal hernia in children?
A hernia occurs when a part of the intestine pushes through a weakness in the belly (abdominal) muscles. A soft bulge shows up under the skin where the hernia is.
A hernia in the groin area is called an inguinal hernia.

What causes an inguinal hernia in a child?
A hernia can develop in the first few months after a baby is born. It happens because of a weakness in the abdomen muscles. Straining and crying don’t cause hernias. But the increased pressure in
the belly can make a hernia more easily seen.

As a male baby grows during pregnancy, the testicles develop in the abdomen. Then they move down into the scrotum through the inguinal canal. Shortly after the baby is born, the inguinal canal closes.
This stops the testicles from moving back into the abdomen. If this area does not fully close, a part of the intestine can move into the canal through the weakened area of the lower belly wall.
This causes a hernia.

In some cases, the part of intestine that pushes through a hernia may become stuck. It is no longer reducible. This means it can’t be gently pushed back into the belly. When this happens,
that part of the intestine may not get enough blood. A good blood supply is needed for the intestine to be healthy and to work the right way.

Girls don’t have testicles. But they do have an inguinal canal. So they can also have hernias in the groin.

https://www.urmc.rochester.edu/encyclopedia/content.aspx?ContentTypeID=90&ContentID=P03092