Hi, with dc1 we had a cheap baby car seat and when she fell asleep on journeys sometimes her head would fall forward, so she would be sleeping with her chin on her chest 
We are buying a new baby seat for dc2, I've been looking at pebble and cabriofix, I wondered whether cabriofix is flat enough that baby won't sleep chin to chest? I think pebble is slightly flatter, but as cabriofix is lighter I would prefer that one, assuming she will sleep comfortably in it?
Thanks!