The CYBEX Aton M i-Size Car Seat offers the latest safety technology available for baby car seats. When installed with the Base M (sold separately) the infant car seat complies with the i-Size regulation. i-Size (ECE R-129) is the EU standard for child safety, making rear-facing travel mandatory until your child reaches 15 months. The Aton M i-Size is suitable for newborns and babies at a height of 45 cm to 87 cm (max. 13 kg).