The phrase "swinging motion" refers to a repeated movement in which something or someone moves back and forth, like a pendulum or a person swinging on a swing. Full definition
The most loving property of this swing is that the alternating motion of swings mimics the natural swing motion of your arm. (babyambition.com)
The baby swing is like baby car seat on a stand that rocks itself back and forth and provides comforting swinging motion with entertainment. (momsandbabyzone.com)
The gentle side - to - side swing motion also keeps your newborn calm and relaxed. (babygearspecialist.com)