A.C.
I have a 22 month old little boy and he has been flying with me since he was born. You don't have to buy them a seat until they are two. My suggestion would be to make sure you have a window seat. I always tried to fly around nap time or at least try to keep him awake until the flight left. I also always feed him a bottle right when the plane was taking off and then he would fall asleep. This seemed to work well for me and hopfully it will for you too. Change the diaper right before you get on the plane, its hard to do it in the air plane.