Spina Bifida (SB) – 1,500 and 2,000 Babies Per 4 Million Births

What is Spina Bifida (SB)?: Spina bifida happens when some of the bones in the spine do not close completely, which leaves part of the spinal cord uncovered. Tissue from inside the spinal canal can bulge out through this opening. In the most serious type, called rachischisis, the opening is very large. Depending on how Read.