Your responsibilities as the driver (under the law)
As the driver, you must make sure that any child under 7 years of age is properly restrained by an approved child restraint that is appropriate for the age and size of the child. They must not travel in the car if you can't put them in an approved child restraint. The vehicle's safety belt on its own is not an approved child restraint.
Approved child restraints include:
infant restraints for young babies (often called baby capsules)
restraints for older babies, toddlers and preschool children (often called car seats)
booster seats for preschool and school-aged children
child safety harnesses (used with or without a booster seat) for preschool and school-aged children.
All approved child restraints will display standard markings to show they have been approved (please see below for details).