The Maxi Cosi car seat base is suitable from birth to around 29lb; this base can only be used with the maxi cosi car seats. This is a great idea they have come up with as all you have to do is fix the base into the car and leave it there as this will insure a correct installation of the car seat every time. To put your babies’ car seat in the car all you have to do is use the simple one click attachment that lets you know if the car seat is in right or not by a coloured indicator. So now, there is no more strapping in the car seat every time all it is now with this base fitted is one simple click and away you go.