In early 2017, Fraser-Pryce announced that she was pregnant and would not be defending her title at the 2017 World Championships in London. She went into labour while watching the world 100 m final that year, and gave birth to her son Zyon the next day via emergency C-section. Despite expectations that she would retire after becoming a mother, she publicly promised a major comeback. She returned to training within ten weeks. However, her early sessions were more challenging than she had anticipated. Due to her C-section, she initially had to run with a special band to stabilise her stomach. She was unable to train her core or lift heavy weights, and frequently had to take time off due to the pain. At times, she was doubtful about her return to peak conditioning: "I [wondered] whether my body would allow me to put the level of work in to get it done.”