We bought AP's for the first time this year and are very excited to have three trips planned in the next 12 months. My youngest daughter will be two when we take our first two trips but 3 for our last one. We are taking my niece on the first trip. Is it possible to buy an AP for my two year old and use it for my niece on our summer trip while the baby won't need it and then use it for her on subsequent trips? I don't want to do anything wrong but this seems like a gray area. Please do not flame me...I really am just looking for answers from people in the know!