booster seat
US /ˈbuː.stər ˌsiːt/
UK /ˈbuː.stər ˌsiːt/

1.
seggiolino rialzato, rialzo
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
:
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We need to buy a new booster seat for our growing child.
Dobbiamo comprare un nuovo seggiolino rialzato per il nostro bambino che cresce.
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Always make sure the booster seat is properly installed in the car.
Assicurati sempre che il seggiolino rialzato sia installato correttamente in macchina.