👶🏽Cardinal movement👉🏼some babies will rock under the pubic bone to make the rotation to exit the pelvis. The top of their head can play peek a boo before crowning. 👶🏽Personally I have seen this more when mom is birthing on her back. Sacrum does not have enough room to move outward to create more space in the pelvis for the baby to rotate under the pubic bone. 👶🏽Changing positions, moving your legs around helps create space for baby to make the rotation under pubic bone to cross your fini