So does that include a photo of my 1 year old girl wearing only a diaper? What about my boy? What about when they're 3? or 7? or...

And what about teenagers wearing tiny bikinis?

The slope is more than slippery, it's vertical.

It is not well defined what "porn" is. In my country it is, as far as I know, perfectly legal to distribute photos of nude children, as long as they are not engaged in a "sexual act". cf. the art of David Hamilton.