Do ventral hernias cause problems in children?

Sometimes. A ventral hernia is any hernia that is present along the front surface of the abdominal wall. This is most often seen at the umbilicus (belly button). Umbilical hernias in children are very common. It is generally recommended to wait till after age 5 to repair these hernias unless the child is having pain due to the hernia or it is very large, since they will often close spontaneously.
Ventral hernias. Can cause problems in anyone of any age. Besides the cosmetic appearance of a bulge, hernias can become incarcerated or strangulated. The smaller the hernia the more risk of the above. See a pediatric surgeon for an opinion.