How is spina bifida inherited?
Spina bifida is thought to be caused by both genetic and enviromental factors. Over 95% of babies born with spina bifida have no family history of the disease. If one of the parents has spina bifida there is only a 4% chance of passing it on to the baby. Look here for more information: http://www.marchofdimes.com/pnhec/4439_1224.