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This is only my personal opinion, and not the advice of someone versed in law, so please take it as such...
There are some really sick people out there and unless you can get written approval from the guardians of the children you post on your site, I wouldn't do it.
In fact, just because of the perverts out there, I wouldn't post pics of any kids.
I'm a bit hard corps about this kind of thing as I'm a loving parent, but I think it is important to protect our children from sick freaks.
Again, this is only my opinion as a parent.
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.