But when Felix attended a routine check-up at 32 weeks, she was shocked to be told that she had severe pre-eclampsia, a pregnancy complication that causes dangerously high blood pressure levels and organ damage, and that she required immediate hospitalisation. The following day, doctors performed an emergency C-section, and her daughter Camryn was born two months early, subsequently spending the first month of her life in the neonatal intensive care unit.

Until then, there had been few signs that anything was amiss for Felix and her unborn baby, other than some swelling in her feet. “I wasn’t too alarmed by that, but I found out I was spilling protein and all these things about my blood pressure. It was terrifying. But our family got to go home,” she says.

While Camryn is now a healthy five year old, Felix is all too keenly aware of similar stories which have resulted in a far more tragic ending. In April 2023, her long-time team-mate Tori Bowie, a former world 100m champion and relay gold medallist at the Rio 2016 Olympics, died in childbirth from complications linked to pre-eclampsia. She was just 32.

“We were on numerous relay teams together, we competed against each other, with each other, and that was extremely shocking,” says Felix. “Someone that I’ve spent so much time with, it was really devastating.”

Worldwide, pre-eclampsia is thought to be responsible for more than 70,000 maternal deaths and 500,000 foetal deaths every year, with many fatalities resulting from stroke or prolonged fitting as a result of the elevated blood pressure. It can occur without warning at any time during pregnancy, with some women developing early-onset pre-eclampsia before 34 weeks, and others experiencing late-onset forms of the condition. Women can even suffer from postpartum pre-eclampsia in the six weeks after giving birth.