booster seat

US /ˈbuː.stər ˌsiːt/
UK /ˈbuː.stər ˌsiːt/
"booster seat" picture
1.

asiento elevador, alzador

a seat that is placed on an ordinary chair to make a child high enough to sit comfortably at a table, or a seat for a child in a car that raises them to the correct height for the seatbelt

:
We need to buy a new booster seat for our growing child.
Necesitamos comprar un nuevo asiento elevador para nuestro hijo en crecimiento.
Always make sure the booster seat is properly installed in the car.
Asegúrese siempre de que el asiento elevador esté correctamente instalado en el coche.