BMW themselves produce a few different infant seats.
I've used the baby one for a year now (in a 740 a Z3 and an M5) and it's the only seat I'd use.
The baby chair is rear-facing and attaches to a steel frame that's buckled in.
The only problem I've found is that if you don't take the frame out for a couple of weeks it leaves indents in the leather (but not permanent).
Sorry, I didn't check your locale. I don't think these seats are sold in the US because they are forward facing. In the US children under 1 year of age must face to the rear of the vehicle. You know, the UK/USA divide continues to widen?
Thanks for your replys. Anyone else out there have any information on the child seats of choice? I'd love one manufactured or at least sold through BMWNA.
Rear facing child seats huh? Cool! If I ever had a little tyke I could nickname him/her "tailgunner". Teach them how to spot police / ghost cars. I'm sure the early warning "wail" sound would come natural to them. No batteries or fancy wiring required either.