Lie on your back with knees bent, feet flat and your baby beside you. Place the ball under your right foot and press your arms into the floor, palms down, for balance. Extend your left leg up to the ceiling (A). Inhale, then exhale as you press into the ball with your right foot, lifting your hips into a bridge position (B). Inhale as you lower your hips to the mat. Do 4 to 10 times. Switch ball to the other foot and repeat.