Many riders continue training until just before delivery. Van Dijk pedaled until two days before giving birth, while Deignan rode until the day before going into labor.

Return timelines vary dramatically. Van Dijk raced again just five months after childbirth, winning a time trial and Deignan returned after seven months, and produced a masterclass to win Paris-Roubaix in 2021.

Larrazabal said mothers who return can often exceed their previous levels of performance.

"There is often a period of exuberance in the first few weeks after labor," he said. "Much of the accumulated stress fades away and the rider feels amazing, both physically and emotionally.

"Our experience shows that athletes can come back to their 100 percent level after pregnancy."

Deignan, 36, will retire at the end of this season, and is currently preparing for the Vuelta Espana Femenina.

"It does feel good; I am really happy with my decision and determined to make it a fun and successful year," she said.

Reuters