The MOMS trial proved prenatal repair of myelomeningocele was an advantage over postnatal repair for the fetus/neonate/child and is the standard of care for maternal/fetal dyads who meet the inclusion exclusion criteria. Investigators plan to maintain all inclusion exclusion criteria for open fetal repair surgery of myelomeningocele with one exception, the expansion of the maternal BMI to 40.0. This population of mothers with a BMI of 35.0 to 40.0 have not been studied. The morbidities of these mothers will be compared to morbidities of mothers with a BMI less than or equal to 34.9 currently in the scientific literature.