It depends on what you are doing and the circumstances when the picture was taken. Little you at the swimming hole with the cousins isn't likely to get you in trouble. Pictures of you from that special weekend with uncle Steve, might.

Yes. There have been cases of teenagers "sexting" each other and sending dirty pictures of themselves to each other. I can't think of any cases offhand, but it just occurred to me that if I typed in "teenager cell phone child pornography" into my search engine at work, things might not go so well for me.

Anyway. There've definitely been kids who've been prosecuted as sexual predators because they've texted dumb things to other teens, and are now required to register themselves as sexual predators. It's serious stuff. Pretty sure there's even been a Law & Order episode about it.

Are we talking about the classic 'naked child on fur rug' shot? Should be fine.

Time delayed narcissism? - yes.

Child pr0n? - not really. Just don't a) be a politician doing that, b) sell it online and/or c) send it to a kid or cop in an email
and you should be fine.

If someone presses the point, tell them you took the pic yourself, when you were a kid (with the timer), and you were too young to prosecute. ;)

I'm tempted to change my avatar to Rev-as-nekkid-baby now. ;)

Without a doubt. Especially if you drew attention to it...for whatever reason...