Spinal DysraphismSpina Bifida OccultaSpina Bifida CysticaAnencephalyMeningomyeloceleCongenital AbnormalitiesNeural Tube DefectsFourth VentricleHydrocephalusPregnancyInfant, NewbornAbnormalities, Drug-InducedEncephaloceleBirth WeightCerebrospinal Fluid ShuntsFolic AcidIndividuationPremature BirthCleft PalateNeural TubeCleft LipMaternal ExposurePrenatal DiagnosisUrinary Bladder, NeurogenicBirth CertificatesGestational AgeAbortion, Therapeutic5,10-Methylenetetrahydrofolate Reductase (FADH2)Abnormalities, Severe TeratoidAbnormalities, MultipleInfant, Low Birth WeightMaternal AgePregnancy Trimester, FirstAcrocallosal SyndromeHeart Defects, CongenitalFetal DeathBirth RatePrenatal CareUltrasonography, PrenatalCrown-Rump LengthCase-Control StudiesArnold-Chiari MalformationMeningoceleSpinePreconception CareLumbosacral RegionPrevalencePregnancy ComplicationsMethylenetetrahydrofolate Dehydrogenase (NAD+)TeratogensFetal DiseasesVentriculoperitoneal ShuntMusculoskeletal AbnormalitiesNicotinamide N-MethyltransferaseSick RoleSacrococcygeal RegionDrainage, SanitaryRisk FactorsHypertrichosisRegistriesUrinary IncontinenceUnited StatesDependent AmbulationPopulation SurveillanceFood, FortifiedHypospadiasCaliforniaSex RatioAbortion, SpontaneousVitamin B ComplexGastroschisisMainePregnancy OutcomeIntermittent Urethral CatheterizationAbortion, InducedSacrumLatex HypersensitivityLimb Deformities, CongenitalRetrospective StudiesBirth OrderFetal TherapiesLower Gastrointestinal TractCampingFamilyMethylenetetrahydrofolate Dehydrogenase (NADP)LatexRadioimmunosorbent TestDietary SupplementsPaternal ExposureMutationDiseases in TwinsPhenotypeUrinary CatheterizationMothersForeheadCystostomyIntelligenceCranial Fossa, PosteriorHispanic AmericansHeart Septal Defects, Ventricular