All child car safety seats manufactured for sale in Canada on and after March 15, 1998 must have a Canadian Motor Vehicle Safety Standard (CMVSS) label on the seat. Prior to this date, a Statement of Compliance label was attached to the side of the child car safety seat. Both the CMVSS and Statement of Compliance are the manufacturer's certification that the child car seat meets all applicable regulations in effect at the time the child car seat was manufactured.
Also check your child car seat for an expiry date. Some manufacturers indicate an expiry date in the instruction booklet or on the child car safety seat. If there is no expiry date, do not use a seat that is older than 10 years from the date of manufacture.