child restraint
US /ˈtʃaɪld rɪˈstreɪnt/
UK /ˈtʃaɪld rɪˈstreɪnt/

1.
a safety device (such as a car seat) designed to protect a child in a vehicle
:
•
Always use a proper child restraint when traveling with young children.
•
The new car comes with advanced child restraint systems.