These multi stage car seats cover the following groups.
TODDLER
These car seats stay in the car, some are from birth and some are forward facing only from 15 months (76cms) generally up to 105cms. Under the older regulations these are called "Group 1" and some are Group 0+1.
CHILD
These seats are also know as booster seats and are used with the adult car seat belt. Suitable from 100cm up to 135-150cms. The law is that a child must use a child restraint up to 135cms or 12 years old whichever comes first. Most child seats are suitable to 150cms.