कन्यां सुतं वा सहितौ पृथग्वा सुतौ सुते वा तनयान् बहून् वा| कस्मात् प्रसूते सुचिरेण गर्भमेकोऽभिवृद्धिं च यमेऽभ्युपैति ||११||
Why does one get a female or a male child?. Why does one get twins, male or female, separate or conjoined, or multiple births? Why does one deliver a child with delay? Why does one twin, in many cases, develop more than the other?
रक्तेन कन्यामधिकेन पुत्रं शुक्रेण तेन द्विविधीकृतेन| बीजेन कन्यां च सुतं च सूते यथास्वबीजान्यतराधिकेन ||१२||
One gets female or male child due to dominance of ovum or sperm respectively. When zygote is split into two, twins are formed and the gender of each of the twins is determined by the relative predominance of ovum or sperm.
शुक्राधिकं द्वैधमुपैति बीजं यस्याः सुतौ सा सहितौ प्रसूते| रक्ताधिकं वा यदि भेदमेति द्विधा सुते सा सहिते प्रसूते ||१३||
When the zygote with dominance of sperm is bifurcated , the woman delivers male twins and when the one with dominance of ovum is getting bifurcated, female twins are born.
The excessively aggravated vayu afflicting the union of sperm and ovum splits the zygote in various ways which results in multiple pregnancy. It is attributed to the effect of past deeds or destiny
आहारमाप्नोति यदा न गर्भः शोषं समाप्नोति परिस्रुतिं वा| तं स्त्री प्रसूते सुचिरेण गर्भं पुष्टो यदा वर्षगणैरपि स्यात् ||१५||
If the fetus does not get adequate nourishment and consequently gets dried up or is discharged, the woman delivers the child after a long time which may even take years for delivery after proper nourishment.