I was raised on a farm and I went streaking around all the time -until I found that thorn bush..... good thing I found that before the rattlesnakes, cottonmouths, scorpions, spiders, wasps, fire ants, poison ivy, etc., though...
The kid'll learn -especially since it's getting cooler -maybe not so much in LA, though.
Clothes aren't natural -but when they become necessary, it gets easier.
Babies don't know poop is poop -so be sure to make that ewwwwiieeee face a lot when it happens and explain why it's not a good idea -even if they don't understand the concept right away, they'll get the jist.