2. Neural Tube Defects
Spina bifida is classified by the Mayo Clinic as a type of neural tube defect. The neural tube, or embryonic structure, forms during early pregnancy and closes typically 28 days after conception.
However, in babies with spina bifida (and other neural tube defects) this embryonic structure that eventually encloses the fetus’ brain and spinal cord develops improperly, leaving defects in the spinal cord and tissues and bones of the spine.