Superfetation woman who occur during an initial pregnancy.Another ovum is fertilized by sperm and implanted in the womb days or weeks later than the first one.
Baby's born called twins since they may be born during same birth on the same day.Multiple birth of one multiple pregnancy , the mother gives birth to two or more babies at a time. Multiple birth occur in most kinds of mammals with varying frequencies.
Such birth are often named to the offspring as in twins and triplets.Each fertilization ovum may produce a single embryo each carrying the same genetic material.Identical twins always have same sex.
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