I have a maxi cosi cabriofix for my 7wk old and I'm beginning to think it's unsuitable - we don't do much driving on a regular basis but when we do it can be quite long journeys, and I didn't know about the whole lie-flat thing, but it makes sense to me. She used to be fine in the cabriofix but she's quite a big baby (14lbs at 7wks) and as time goes on, seems to hate the carseat and especially has trouble pooping whilst in it! It's now to the point where she screams pretty much the whole time she's in it, stops the second she's lifted out and has a massive poo with relief! The carbiofix fits on my babylogger buggy but to be honest, the carseat actually never leaves the car we find! so it's not important that the replacement is uncompatible.
Only trouble is she doesn't much like being laid flat on her back either! However, at least she can poop like that?
I like the idea of the jane matrix if it can do lie flat and sit up...anybody have one and likes/dislikes it? Or anybody have another lie flat seat to recommend?