Having boys can shorten a mom’s lifespan

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Researchers in Finland have found that having a boy, historically speaking, shortens a mother’s life expectancy by a statistically significant amount. Their study, which looked at Finnish villagers in pre-industrial Scandinavia, showed that a woman’s risk of death increased by seven percent per year for each son born. By investigating parish records for individuals in eight parishes who lived during the seventeenth to mid-twentieth centuries, “they found that if a woman in these communities was 37 years old at the time of having her last child, her life expectancy would vary depending on the sex of her children.”

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Your fetal cells are most likely still living inside your mother, even if she had you several decades ago

It turns out that the bonds between a mother and her child are not merely psychological or even genetic: During pregnancy, the mother and the fetus literally exchange cells, leaving identifiable bits and pieces of the child inside the mother – and vice versa – for decades after birth.

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