bouncing

adj. healthy, strong, and full of energy — often used to describe a baby.

adj. vigorous, healthy, and robust; most frequently used in the fixed collocation 'bouncing baby'.

“They were delighted to announce the birth of a bouncing baby boy.”

“The couple returned from the hospital with a bouncing baby girl, much to the relief of the waiting grandparents.”

Informal

n. the movement of something that hits a surface and jumps back.

n. the gerund form denoting the act or instance of a rebound.

“The constant bouncing of the ball against the wall was very noisy.”

“The rhythmic bouncing of the basketball provided a steady soundtrack to the afternoon practice session.”