As soon as you know your wife is pregnant start reading "A River Runs Through It" and any Gierach, lyons, Sparse Hackle etc genre books to the baby. After they are born be sure to play the sound of a river or brook beside their cribs. Take them with you as early as possible in a papoose bag and let them see the joy that fly fishing brings. When they are about three get them a 6 foot two weight and get them going. By the time they are 5 you should be able to cut down some hip waders for them and glue on some rubber booties. Get them interested in gear early, on birthdays give them something they can grow into. My only regret in life is that I did not start early enough. But then my father was not a fisherman.