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Ginekologia i Poloznictwo
ISSN 1896-3315 e-ISSN 1898-0759

Factors influencing the formation of twins? part IV ? lactation



There is a common belief that during the breastfeeding a woman can not get pregnant becauselactation stops the occurrence of ovulation. Also, some studies have shown that during lac-tation there are more than 10. fold greater chance of conceiving not only dizygotic but alsomonozygotic twins. In case of dizygotic pregnancy it is probably caused by a sudden increasein the concentration of FSH in the serum upon the resumption of the menstrual cycle. Ho-wever, the mechanism responsible for the increase in the proportion of monozygotic twinpregnancies that arise as a result of secondary division of the originally single zygote into twoseparate and genetically identical embryonic structures has not been elucidated yet.