I hope the fee does discourage lap children. I truly believe that the safety of the child should outweigh the cost of the ticket and there is no doubt in my mind that the child is safer in a safety seat. This February we were across the aisle from a couple with two lap children and another young child (maybe four or five). They argued with the Southwest flight attendant for about ten minutes when told that one of the parents had to move to another row with the lap child. They didn't seem to care that in an in flight emergency, one of the children would be without an oxygen mask - there are four per row in case one fails. That means only one lap child per row. Or at least that is what the flight attendant was telling them.

This was probably around 18 yrs ago.