This study evaluated the effect of antenatal aquatic physiotherapy sessions on low back pain in pregnant women. Thirty-three subjects (31.8 + 4.8 years) participated in a prospective, quantitative, repeated measures within subjects design. Low back pain was measured using a Numerical Rating Scale immediately before and after each session. The subjects significantly improved their post session pain scores by an average of 44 percent. Pain did not increase significantly from the beginning to the end of the course of sessions as is normally expected in this population and the number of sessions made no significant difference. Conclusions: This finding suggests that attending once a week will effectively manage low back pain for pregnant women.