Or that exposure to a fetus for prolonged periods of time has a measurable effect. You can reliably tell the sex of a fetus with a mother's blood test a couple

Or that exposure to a fetus for prolonged periods of time has a measurable effect. You can reliably tell the sex of a fetus with a mother's blood test a couple months after conception. I still think it's a bit unlikely that there's a meaningful connection to be had there, but I wouldn't be totally shocked if I were proven wrong.