So I have a 12 month old and I am super lost on how the whole seating works! (havebabywilltravel.com)
They must stay secured in the car at all times and you can't remove the whole seat with the baby in it. (bestbabystrollerjudge.com)
I found infant seats to be very convenient because you can take the whole seat out of the car in one click and avoid waking up a sleeping baby. (parentingsquad.com)