I am flying SW from Chicago to Orlando with my twin grandsons (18 months at the time) and the parents would like to buy a ticket for one of the boys so that they have a whole row and can change off and not have to hold the boys the whole flight. Can anyone tell me how discounted the fares are for babies? In the past when we have flown with little ones, I was unaware that they had infant fares and bought regular tickets for them; this particular set of parents are fine with having lap babies, and have flown with them before, and don't want to buy tickets for both. Is the discount a certain percentage off the fare? (I know I can call them to ask, but no time so sit on hold...)