Most pregnant women use pregnancy pillow for back pain and to give them comfort during sleep.
As the body weight increases during the pregnancy, it puts a lot of pressure on your legs, hips, and back. Using a pregnancy pillow to help you sleep can significantly ease body aches and pains.
There is no fixed time as such for using a pregnancy pillow. However, at around 20 weeks of pregnancy, the belly starts to expand, causing pain in the ligaments and other parts of the body due to the increase in weight. This is a good time to start using a maternity pillow.