Sorry Op about finding that out. I don't know what guys see in children, i see nothing attractive about it but to each their own.
If it disgusts you that much then go, tell him bye bye and good riddance. You deserve someone with the same sexual interests as you, not someone who wants to have a child just so he can molest them.
Not saying he would actually do such a thing, but seeing as it is your fear I understand it completely. Good luck with it all.
~bob~