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Premature delivery is a major complication of in utero myelomeningocele repair. The prematurity rate in MOMS (Management of Myelomeningocele Study) was 79%, with a mean gestational age at birth of 34 weeks. We speculated that prematurity could also influence urological outcome in patients operated on prenatally for myelomeningocele.Beginning in November 2011, we prospectively followed a population of patients with myelomeningocele who had undergone in utero repair.We compared patients based on gestational age at birth, ie younger than 34 weeks (group 1, 42 patients) and 34 weeks or older (group 2, 37 patients). Mean gestational age at birth was 28.3 weeks (range 25 to 33) in group 1 and 35.2 weeks (34 to 38) in group 2. Of the cases 47.5% in group 1 were classified as high risk, 35% as incontinent, 10% as hypocontractile and 7.5% as normal. By comparison, 54.5% of cases in group 2 were classified as high risk, 33.3% as incontinent and 12.1% as normal. Differences between the groups were not statistically significant. Mean followup was 27.9 months in group 1 and 24.3 months in group 2.Our results show that gestational age at birth has little impact on bladder pattern. These data reinforce the need to follow this population closely.