Disney world with a 1 year old

I was supposed to take my 2 teenage boys, age 14 & 16 to disney world this August. They have never been. Then surprise, found out im pregnant & due this August. I dont want to let my boys down, want them to go, they had their hopes up. Do you think waiting until next August is ok to go with a 1 year old child or is it too much? Is it doable? My boys will be 17 & 15 by that time.