Child Seats
I guess what I meant by Booster seat was an approved car seat with the proper stickers.
In the US the lap child is to be held on the parents lap with no seat belt on the child. The FAA here has determined that they are not safe and may impede evacuation.
Again in the US the flight attendant is not allowed to put the child in the seat or even touch the seat. They may supervise the installation but due to so many people in the US running off to lawyers with some hairbrained law suit...F/A's just don;t touch them.