When your child reaches a weight of 9kg – typically around 12 months – she may move from a first-stage baby seat (Group 0) to a Group 1 seat.
If your baby is in a Group 0+ seat, which has a weight limit of 13kg, you can wait a little longer.
A Group 1 car seat can be used until your child weighs 18kg – a typical weight for a four-year-old. Once your child reaches four she will move to a Junior Group car seat.
Browse our reviews of Group 1 car seats, featured in the February 2015 issue of M&B.