These Twin Couples Made Magic: Identical Twins Married Identical Twins – Now Their Children Are Cousins And Siblings!
But Maybe Pregnancy Synchrony Is a Real Thing

Medical science may not support the theory of menstrual synchrony, but we can’t deny that such a possibility exists. And the internet is full of real-life accounts of girls, ladies, and women whose menstrual cycles coincide with roommates and family members simply because they share space.
A 2016 research paper by Maryanne Fisher suggests that synchronous pregnancies could also exist. This would mean that women can intentionally plan their pregnancies to coincide. And whether the science agrees or not, one thing is clear―the Deane sisters wanted to synchronize their pregnancies, and somehow, they succeeded.
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