Hey! for you new Mom & Dads out there...check with your airline but United Airlines allows infants to earn frequent flyer mileage points, even though you only paid a fraction of the cost for the ticket.
Josh, my 9 mos old son, flew to the States last month and has acquired 20,000 UAL points. That's enough for a free adult intra-Asia ticket to Bali, Maldives, HKG, Shanghai etc. It's a great benny...!! So don't forget to check your airline when making those long trips home/overseas!!