The first stage of labor is the longest and involves three phases: Early Labor Phase –The time of the onset of labor until the cervix is dilated to 3 cm. Active Labor Phase – Continues from 3 cm. until the cervix is dilated to 7<span> cm. Transition Phase – Continues from </span>7<span> cm. until the cervix is fully dilated to </span>10<span> cm.</span>
