The aim of this study is to evaluate the impact of lumbar spine ultrasound on the success rate and efficiency of labor epidural placement in the lateral position. The investigators hypothesize that ultrasound imaging of the lumbar spine of women in early labor will yield similar ultrasound results when done immediately prior to epidural placement. The investigators also hypothesize that the use of ultrasound with landmarks marked and depth to the epidural space estimated will facilitate epidural placement in terms of both efficiency (time required for placement) and efficacy of pain relief.