When Junior was an infant we used the Maxi Cosi infant car seat and adapter along with the Quinny Buzz 4. Although the Quinny is large (will fit in the trunk on E90/E92) it has great quality. When he grew out of the infant car seat about a 14 months ago - we purchased an Recaro Pro Ride car seat that fits in all of our vehicles including the MINI. We also used the isofix attach points.
Congrats on the newest addition to your family
