OTTAWA - The federal government says updated child car safety seat regulations will take effect on New Year's Day.

Under the changes, child car seats will have to accommodate children weighing up to 66 pounds, instead of the current 48 pounds.

In addition, an infant will be defined as someone weighing up to 22 pounds, up from the current 20 pounds.

The government says there is no need to replace a child seat as a result of the new standards.

However it says a child car seat should be replaced if it was installed in a vehicle involved in a collision.

Health Minister Leona Aglukkaq says the new regulations will mean child car seats sold in Canada "will be as safe as possible."