Car seats that meet the UN R129 standard, also known as i-Size, are safer and easier to use than previous standards. They are also compatible with most modern cars, as they use the ISOFIX system, which has been standard in cars since 2008.
i-Size seats are classified by length, not weight, which makes it easier to choose the right seat for the child's size. They are also designed to provide better protection in frontal, side, and rear-end collisions.
As of September 1, 2024, the sale of UN R44 seats will be banned in the EU. It is therefore important to choose an i-Size seat if you are buying a new car seat.