When twins are born with their bodies connected, they are called conjoined twins. Some twins share only a small amount of tissue, and both children may have ...SkiptonavigationmenuSkiptocontentHighPriorityAlertCOVID-19:VaccineInformation,VisitorInformationandWhattoExpectClosealertInformationalAlertMontlakeBridgeClosure:LearnaboutdetourstoSeattleChildren’sduringtheMontlakeBridgeclosureAug.9throughSept.3,2021.ClosealertInformationalAlertLearnaboutSeattleChildren’sAnti-RacismOrganizationalChangeplanandreadanupdateonCovington&Burling’sAssessmentReport. ClosealertHomeConditionsConditionsConjoinedTwinsScheduleanappointmentwithPrenatalDiagnosisandTreatmentProgram+Talkwithyourpregnancycareproviderforareferral.Ifyouhaveareferral,call206-987-5629toscheduleanappointment.HowtoscheduleIfthisisamedicalemergency,call911.Findadoctor+MeetthePrenatalDiagnosisandTreatmentteam.Meetthe PediatricGeneralandThoracicSurgeryteam.Locations+PrenatalDiagnosisandTreatmentProgramat SpringbrookProfessionalCenter:206-987-5629PediatricGeneralandThoracicSurgeryProgramatthe hospitalcampus:206-987-2794Referapatient+Consultations(providersonly):Call206-987-5629.Ifyouareaprovider,faxaPrenatalAppointmentRequest(PDF)(DOC)plusallobstetricclinicrecordsto206-987-2962.Providers,read howtoreferpatients.Whatareconjoinedtwins?Whentwinsarebornwiththeirbodiesconnected,theyarecalledconjoinedtwins.Sometwinsshareonlyasmallamountoftissue,andbothchildrenmayhavealltheorgansandotherstructurestheyneed.Usually,theconnectionismorecomplex.Insomecases,childrenmayshare: Vitalorgans,like1heartManystructures,likeseveralpartsofthe digestive, genital and urinary systemsAlargeportionofthebody,likeallofthelowerbodyPartofthebrainandskullWhatcausesconjoinedtwins?Conjoinedtwinsbeginasasinglefertilizedegg.Sometimesasingleeggsplitsinhalftocreate2separateidenticaltwins.Usuallythishappensabout2weeksaftertheeggisfertilized.Thereare2ideasaboutwhatcausesconjoinedtwinning:Theeggdivideslateanddoesnotdividealltheway.Theeggdividesbutthenjoinsbackt