There is no fastest way to induce labor in a 39-week pregnant woman. Generally, according to the situation of the pregnant woman, there are ways to induce labor by contraction, uterine balloon, drugs to promote cervical ripening to induce labor, yoga ball and so on. 1. Hydrocodone induction: for pregnant women with indications for induction of labor and conditions for vaginal trial of labor, hydrocodone can be given to induce labor, inducing contractions and promoting the progress of labor. 2. Induction of labor by uterine balloon: For pregnant women with poor cervical conditions who want to try vaginal induction of labor, they can choose to place a uterine balloon to induce labor, dilate the cervix, induce contractions, and promote the progress of labor. 3. Drugs to promote cervical ripening induction of labor: for pregnant women with poor cervical conditions who want to try vaginal labor, you can also use dinoprostenol pessary to promote cervical ripening, placing the pessary at the back of the cervix, to promote cervical softening, induce contractions, and promote the progress of labor. 4. If there are no other comorbidities or indications for induction of labor in a 39-week pregnancy, the head of the fetus can be lowered by sitting on a yoga ball to promote the onset of uterine contractions and advance the progress of labor. If there are no comorbidities or indications for induction of labor, there is no need to induce labor before the 41st week of pregnancy. If you need to induce labor, you have to be examined and evaluated by a professional obstetrician and choose the appropriate way to induce labor.