Students are demonstrating equilibrium-standing through head righting reactions. Students are bringing their heads and trunks back to an upright position after being pulled by the arm to one side. 12-21 months and continues throughout life.
Students are demonstrating a sideways stagger. Students take a step in the same direction they are being pushed in by their shoulder. 15-18 months and continues throughout life.
Students are demonstrating an equilibrium reaction while lying on their backs. As the leg crosses over the opposite leg, the trunk and head will follow. 5-6 months and continues throughout life.