Crib
The baby is sleeping in a crib.
A crib is a special bed for babies.
Cribs have tall sides so babies cannot fall out.
Highchair
A highchair is a special chair for babies.
Highchairs are tall and they have a seatbelt and a tray.
The seatbelt and the tray prevents the baby from falling out of the highchair.
Stroller
The dad is pushing the baby in a stroller.
Strollers have wheels, a handle, and a seat.