Non-identical twins are created when a woman produces two eggs at the same time and both are fertilised, each by a different sperm.You'rehere:HomepageLetushelpPregnancyandbirthFindingoutIdenticalornon-identical?Identicalornon-identical?Whetheryourbabiesareidenticalornon-identicaldependsonhowtheywereformed.Non-identicaltwins arenomorealikethananyotherbrothersorsisters.Non-identicaltwinsarecreatedwhenawomanproducestwoeggsatthesametimeandbotharefertilised,eachbyadifferentsperm.Thefertilisedeggiscalledazygote,andthesenon-identicaltwinsareknownasdizygoticorfraternaltwins,becausetheygrewfromtwoseparatezygotes.Thebabiesarenomorealikethananyotherbrothersorsisters,andmaybebothmale,bothfemaleoroneofeach.Identicaltwinshave thesamegenes,physicalfeaturesandsex.Identicaltwinsoccurinaboutone-thirdofmultiplepregnancies.Knownasmonozygotictwins,asingleeggisfertilisedthensplitsintotwo(or,veryrarely,threeormore)creatingidenticalbabieswiththesamegenes,physicalfeaturesandsex.Theymayormaynotshareaplacenta.Characteristicssuchassizeandpersonalitydependonnon-geneticfactors,somaybedifferent. Thisdiagramshowsthedifferentcombinationsofplacentasandamnioticsacs:  Tripletsandhigherordermultiples.Tripletsandhigherordermultiplesareformedthiswaytoobutmaybeindifferentcombinations.Forexample,youmayhaveasetoftripletswheretwoareidenticalandoneisnot.Learnmoreabout:BeingpregnantwithmultiplesParentingtwinsortriplets RegisterwithTwinsTrustSignupwithTwinsTrusttodayforaccesstomoreresourcesandguides.RegistertodayTwinsTrusthasaninformativefreewebinaroffering supportandadvicetopregnantwomenandtheirpartnersatthestartoftheirpregnancyjourney.Anintroductiontotheworldoftwins,tripletsandmore ×RegisterforfreeresourcesWe'reheretosupportyoueverystepofthewayalongyourjourneywithtwins,tripletsormore. Registerforfreeresources,orloginhere. Registertoday