Hi there
The same happened to one of my twins when she was newborn. However like what the other parents say, we were told it would go away by itself within a year or so but if it was still there when she was 2, then they might consider surgery. Like in 80% of cases, the hernia subsided by itself when she was around 6 months old and now her belly button is fine. The hernia is caused by a gap in her muscles so that her intestines bulge out but so long as the area is soft and the intestines can go in and out freely, then there is nothing to be concerned about. THe gap will usually close itself thus causing the hernia to go away.