The process is very simple; if you have a kid whose age is less than 24 months and you are traveling within the United States, as long as they are seated on your lap, you don’t have to pay for them. But you can travel only with your one child. But in the case of overseas travel, you have to pay for your infants, but a small percentage of normal airfare plus taxes would be added. It is advisable to carry paper tickets, even if they are seated on your lap. For more information, dial 1-888-284-0908.