Under the UN R44/04 regulation car seats are organized into groups. Many car seats can be used for more than one group, often adjusting as the child grows. • Group 0+ car seats are for children weighing up to 13 kg (0 – approx. 18/24 months old), for example our Aton series of infant car seats. • Group 0+/1 car seats are for children weighing up to 18 kg (0 – approximately 4 years). • Group 1 car seats are for children weighing between 9 and 18 kg (approx. 9 months – 4 years). • Group 1/2/3 car seats are for children weighing between 9 and 36 kg (approx. 9 months – 12 years), for example our Pallas series of 2-in-1 car seats. • Group 2/3 car seats are for children weighing between 15 and 36 kg (approx. 3 – 12 years), for example our Solution series of high-back booster seats.