Sadly not for me as no baba yet, but a friend is planning on buying a 'carry cot' car seat.
Example at Mothercare
I didn't even know you get them but it got me pondering. The one she's getting (not sure if it's the exact model I've linked to) has an internal harness and fits onto one of those isofix (?) bases you can fit into cars.
What do more experienced parents think? Could this be a good idea? (ignoring the hefty price tag ).
The idea of having baba lying flat appeals to me but kinda like the idea of baba being able to see out from a seat. Pointless worrying at this point but takes my mind off ttc