re: 4 year olds first deer hunt

I didn't take my kids on their first hunt until they were 7-8 yrs old. In addtion to good points already mentioned:
-WARMTH!! It's not possible to keep a kid warm, but try your best. Their feet ALWAYS get cold. The best thing I ever did for their feet was to buy a pair of "Arctic Shield" insulated overboots Keep their feet dry walking in then put on the overboots when you get in the stand. Don't try buying nice insulated boots for a child. You can't find well insulated boots and if you do they'll cost $$$$; then 2 mos later your child's foot will have grown 2 sizes!!
-PM hunts>>>>>>>>AM hunts. For my kids, AM hunts were a tribulation.
-Do NOT expect to kill anything. You minght, but don't count on it. If you can't accept this YOU'RE not ready to take your child hunting.
-Keep the hunt SHORT. Once they get bored and fidgety, the hunt's over.

You're doing a good thing by taking your child hunting. The main thing is you need to do everything you can to ensure an enjoyable experience for you child. A bad experience can be ruinous for your child and maybe cost you your future hunter.