Bouncing up and down on a birth ball doesn’t help, and can actually hinder the rotation of a back-to-back baby because of how it affects the pelvis and the baby’s ability to move 😬 Here’s why: 1. Bouncing compresses the pelvis ❌ When you bounce, especially in a vertical motion, it tends to compress the pelvic inlet (the top of the pelvis) slightly. For a baby in the back-to-back position, we ideally want to create more space at the top of the pelvis to encourage them to rotate and flex their he