Skiptositealert.SkiptocontentYouarehereHome>PatientCare>OurCenters>CenterforPrenatalPediatrics>ConditionsWeCareFor>DichorionicTwinsCenterforPrenatalPediatricsDichorionicTwinsWhataredichorionictwins?Dichorionictwinsareaformofmultiplegestationinwhicheachtwinhasaseparateplacenta(bloodsupply)andamnioticsac.Dichorionictwinsareusually–butnotalways–fraternal(non-identical). TwinsrepresentmorethanthreepercentofallU.S.livebirths,withthemajoritybeingdichorionic.Dichorionictwinsmorecommonlyoccurinthesettingoffertilitytreatmentssuchasin-vitrofertilization(IVF),inwomenofadvancedmaternalage,andinpatientswithfamilyhistoryoftwinbirths.Howisthisconditionmanagedduringpregnancy?Astwinsareatincreasedriskforpretermlaborandprematuredelivery,dichorionictwinsarecloselymonitoredthroughoutpregnancy.Surveillanceincludesserialassessmentsoffetalgrowthpatternsandcervicallength,aswellasregularmaternalhealthevaluationstomakesurethatthemotheristoleratingthepregnancywell.Inadditiontoroutinetwinanatomyassessment,fetalechocardiographyisalsorecommendedinpregnanciesconceivedusingIVF.Whatisthelikelyprognosisforthiscondition?Overall,theoutlookforadichorionictwinpregnancyisgood;however,thesepregnanciesareatriskforprematuredelivery.Roughly50percentoftwinsarebornbeforethethirty-sixthweekofpregnancy.Whennoothermaternalorfetalcomplicationsarepresent,twinoutcomesarerelatedtodeliverytiming.Backtotop