The Everything Pregnancy Book by Paula Ford-Martin

The Everything Pregnancy Book by Paula Ford-Martin

Author:Paula Ford-Martin [Ford-Martin, Paula]
Language: eng
Format: epub
ISBN: 9781440530357
Publisher: Adams Media
Published: 2012-07-15T00:00:00+00:00


Monozygotic, or identical, twins may each have their own set of fetal membranes, or they may share an amniotic sac (monoamniotic), a chorion membrane (monochorionic), or both.

A single zygote that produces twins usually splits within days of fertilization but may wait up to 2 weeks. Zygotes that split beyond 14 days increase the risk of resulting in conjoined twins, or twins who haven’t separated completely and develop with shared body parts or organ systems. Fraternal twins, because they start life as two eggs fertilized by two sperm, do not run the risk of conjoinment.



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