in labor
In the act of birthing one's offspring. Come on, we've got to get to the hospital—Marisa's in labor! Can you believe she's already been in labor for 15 hours? What the heck am I supposed to do for a cat that's in labor?
in labor
[of a woman] experiencing the pains and exertion of childbirth. Susan was in labor for nearly eight hours. As soon as she had been in labor for an hour, she went to the hospital.