THURSDAY, OCT. 3, 2019 -- No, you're not seeing double as often these days: After decades of rising, twin births are declining in the United States.
Twin birth rates had been on the rise for 30 years, but dropped 4% between 2014 and 2018, health officials said in a new U.S. government study. That's the lowest level in more than a decade. In 2018, there were 32.6 twins for every 1,000 U.S. births.
TUESDAY, Oct. 15, 2019 -- Undiagnosed chlamydia infection can harm male fertility, a new study suggests.
"Chlamydia infection has been associated with women's infertility but much less is known about its impact on male infertility, particularly if men do not experience symptoms, which is estimated to be in about 50% of cases," said study leader Ken Beagley, a professor of immunology at Queensland University of Technology in Australia.
MONDAY, Oct. 14, 2019 -- Men who use marijuana at least once a week are twice as likely to see their partner's pregnancy end in miscarriage, compared to those who use no pot, new research suggests.
Miscarriages related to frequent male pot use tended to occur within eight weeks of conception, which bolsters suspicions that marijuana use damages sperm in some essential way, said lead researcher Alyssa Harlow, a doctoral student at the Boston University School of Public Health.