Plains All American Pipeline, L.P. (Plains) is engaged in the transportation, storage, terminalling and marketing of crude oil and refined products, as well as in the processing, transportation, fractionation, storage and marketing of natural gas liquids (NGL).
The first stage of labor is the longest and involves three phases: 1  Early Labor Phase âThe time of the onset of labor until the cervix is dilated to 3 cm. 2  Active Labor Phase â Continues from 3 cm. until the cervix is dilated to 7 cm.  Transition Phase â Continues from 7 cm. until the cervix is fully dilated to 10 cm.
3. Dilation: Your cervix opens. As your baby's birthday approaches, your cervix begins to dilate, or open up. Dilation is checked during a pelvic exam and measured in centimeters (cm), from 0 cm (no dilation) to 10 cm (fully dilated).