Inclusion and exclusion criteria for fetal repair of MMC was established by the Management of Myelomeningocele Study (MOMS Trial) and these criteria are the standard of care throughout the United States. These criteria state exclusion for hypertension and diabetes which are known co-morbidities for obesity. Investigators plan to expand one exclusion criteria for open fetal repair surgery. Currently, an exclusion factor is a maternal BMI of 35.0 and greater.Investigators will maintain all other inclusion and exclusion criteria (including excluding for hypertension and diabetes) with the exception of expanding the BMI to include mothers with a BMI of 35.0 to 40.0. Co-morbidities of the research group will be compared to the comorbidities of the mothers published in the MOMS trial.