A stroller is a chair with wheels for babies or small children to sit in while someone pushes them around.
Strollers are helpful for parents and caregivers to take young children for walks or outings.
Examples:
The baby fell asleep in the stroller.
She pushed the stroller through the park.
The stroller has a sunshade to protect the baby from the sun.
The stroller wheels squeak when they go over bumps.
The stroller is like a little bed on wheels for the baby.
The stroller is red and has a bear on the front.