I also don't parse why you would have wanted to get that picture removed... for the benefit of the child, whom you don't know? Why let them/its parents do it if it causes any issue? Imho, the more you sanitize, the worse the problem becomes.
Also, I am very much going to educate my child that in this world things you do are registered on social media and the Internet, and that pictures of her will be difficult to remove. That would, for example, result in that she'd refuse to get on camera during sex. That's for later though.
As for the picture. Because I genuinely thought I stumbled upon child pornography. It had to do with the pose, that nobody else was on the picture, and probably also some kind of discrimination on my side (the kid was Asian) plus the movie Holly [1] having made a deep impact on me.
Now pictures of adults as teenagers, that's a different kind of laugh ...
For myself, I could care less. I don't give a rat. For my partner, that's her choice. My child however, I have an issue with that.
I assume facial recognition will progress in the coming years, and I don't want my child's high school classmates to find a naked picture of her when she was still a toddler.
Whether I'm right or wrong on this, I cannot tell yet.
However if history repeats itself, she has a form of autism and will get bullied on school both like her father and mother. I don't want my kid to get bullied by this; my (in)action.
EDIT: Oh, and I once reported a picture hosted on Yahoo.com with a naked child on a beach. The response I got was that it was likely shot by the family as part of their children's pictures so it was "OK". That has the consequence of it being impossible to get such removed (though in the EU we do have the right to be forgotten).