I would only add that the "irregularities" are usually (unless one is flying ASA) quite rare and you are unlikely to experience any difficulties.

If you fly a LOT, though, the law of averages is going to bite you...again and again, so you learn how to deal with it and use your status / knowledge of the system for all it's worth.

I've had a lot happen to me in my flying career, but on a percentage basis, (and I'm just guestimating here), 5-10 "problematical" flights for over 100 flights a year gives about a 1-in-20 to a 1-in-10 chance of having a problem.

So I'd say not to sweat it; the odds are in your favor. Hope it's a rewarding and expanding experience for you and your child! ^