The group 0 car seat is the very first stage and has the lowest weight range.

Car seat stages can be confusing at the best of times and trying to understand which seat does what and what that group number means can be very frustrating!

Child seats are grouped based on the weight of the child that they can accommodate.

As an example: A group 0+ seat is suitable from newborn to 13kg rear facing, a group 1 seat can accommodate a child between 9-18kg forward facing or some rear facing. Therefore if you wanted a seat that could carry your baby from newborn right through to 18kg, it would be referred to as a 'group 0+1' - as it covers both weight categories!

A group 0 car seat is suitable from newborn up to 10kg – approx. 6 months old. https://www.reebabycn.com/baby-c...ar-seat-for-group-0.html