Multiple pregnancies happen due to division of the zygote (''orshukra-artava'') by vitiated ''vata'' - an observation noted in all Ayurvedic texts and accepted by all commentators (SS.Sa.2/37; AS.Sa.2/6; AH.Sa.1/6; KS.Ka.6/59; BP.Pur.3/39). Apart from this phenomenon, instability of mind of the couple during coitus is responsible for producing twins as it influences the ''doshas'' and ''dhatus'' that produce fetal parts (HS.6th sthana.1/38-39). And finally, there are karmic deeds of the soul of the fetus that the parents have no control over. (CK on CS.Sa.2/13-14). (14)
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Multiple pregnancies happen due to division of the zygote (''orshukra-artava'') by vitiated ''vata'' - an observation noted in all Ayurvedic texts and accepted by all commentators. [Su.Sa.Sharira Sthana.2/37]; [A.S.Sharira Sthana 2/6]; [A.H.Sharira Sthana 1/6]; [K.S.Khilasthan 6/59]; [B.P.Purvakanda 3/39] Apart from this phenomenon, instability of mind of the couple during coitus is responsible for producing twins as it influences the ''doshas'' and ''dhatus'' that produce fetal parts. [H.S.6th sthana.1/38-39] And finally, there are karmic deeds of the soul of the fetus that the parents have no control over. [Chakrapani on Cha.Sa.[[Sharira Sthana]]2/13-14] (14)