Why do we humans give birth to one baby at a time?
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This is because the human female reproductive system only releases one ovum with each menstrual cycle. This means that only one egg/ovum can be fertilized at a time. This is the main reason why human beings only give birth to one baby at a time.
In the case of twins, it is a rare occurrence where two ova are released at the same time(non-identical twins) or one fertilized ovum divides to form two zygotes(identical twins).
In the case of twins, it is a rare occurrence where two ova are released at the same time(non-identical twins) or one fertilized ovum divides to form two zygotes(identical twins).
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