The britax evolva 123 is suitable for use from 9 to 36kg44 the evolva has 2 belt adjustments to allow the car seat to grow with them from 9 18 kg your child is secured with the seats click amp safe audible harness system then from 15 36kg the harness is removed and the child is secured with the cars 3 point belt44 seatbelt guides will ensure that you position the belt correctly across your child to keep your child comfortable there is an upright and recline position44 the headre