Suitable from birth up to 13 kgs (approximately birth to 9 - 12 months). 
For a very young child, this is the safest type of restraint available. Rearward facing seats can be used in the front or rear of the car using the adult lap and diagonal seat belt, or by ISOFix attachment points.
The law prohibits the use of a rear-facing child restraint in the front seat of any vehicle fitted with an active frontal airbag. This is because the restraint will be too close to the dashboard and in an accident, the expanding airbag is liable to cause serious or fatal injury to the child.