I flew once (and only once) with my son as a lap baby when my grandfather passed away and I basically just grabbed the baby and rushed to the airport and bought the next ticket out. Son was an infant. I wasn't questioned on the way out, but when I tried to fly back, it was a mess. I didn't have a ticket for him or a birth certificate and was now 100s of miles from home - by myself, with a baby, grieving. The ticket counter guy at the departing airport was all about enforcing the rule (which he should be, of course), but I was kind of in a heck of a hard spot since SWA sold me the ticket away from home without mentioning that rule or enforcing it. I don't know why they didn't just suggest I buy him a ticket, but they didn't - and I was grieving, crazed Mom, so it didn't occur to me either. The ticket counter guy scolded me like a school child as I stood there crying trying to figure out what to do. Then, after he finally felt he'd made his point, I guess, he pulled out an affidavit I could sign to promise the child was indeed under 2 and that if I was lying, I would be fined $25,000. Or something like that. So, I guess that's an option?