Ha&;s rule is related to
Mechanism of Internal rotation.
Mechanism of Crowning.
Mechanism of Engagement.
Mechanism of Restitution.
Elastic recoil of Levator Ani occurs bringing the occiput forwards in the midline. The process is repeated until the occiput is placed anteriorly. This is called as rotation by law of pelvic floor- Ha&;s rule.
General obstetrics