Baby safe i size has been designed to conform to the new car seat regulation ece r129 i size and is suitable for newborns up to 15 months so they can fit into the seat up to 83 cm in height the infant carrier has a newborn insert for extra support also offering energy absorption in case of an impact the insert can be removed and the height of the headrest adjusted allowing for more space as your child grows the baby safe i size car seat is compatible with the uppababy vista pushchair us