The shortest but most intense part of labor is transition. This is when the cervix becomes fully dilated. Contractions may become even stronger. They may last 60 to 90 seconds, with almost no rest in between. This is a demanding time. You might experience hot flashes, chills, nausea, vomiting, or gas. Intravenous (I.V.) pain medicines are rarely given so close to your baby's birth. But epidurals are continued during birth. Help yourself by working with your support person or labor coach. You may feel an urge to push or bear down. But don't push until your doctor or midwife tells you to.