EDIT: By 'car seat' I mean a seat for an infant/toddler/child.
But mosto of us will be delighted to have access to what is effectively an Uber only cheaper and more plentiful.
so, 12M families would like to own a car for 3 years.. (approx. multiple with number of children)
http://www.cdc.gov/motorvehiclesafety/images/child_passenger...
Neither are church pews, why are you worried about ergonomically designed seats for toddlers? Daily 8 hour car rides?
Or is it along the lines you are worried you won't be paying enough attention to your child and something horrible could... while you are not driving?
Self driving cars don't have to drive like humans, they have to drive like 90% of the other cars. Remove the humans and self driving cars can adopt far more sophisticated traffic patterns than the simple stop/go of most city traffic.
https://www.amazon.com/baby-infants-car-seats-booster/b?ie=U...