Scott Snyder didn't want to write Damian during his Batman run because he's got a son around the same age and didn't feel comfortable with the idea. Or so I've heard.
But as far as I know he's got no issue with kids or writing kids. Hell, he's writing a very young kid right now in Justice League (Hawkgirl and J'onn's son from a fictional future). But you'll notice that kid isn't getting into fist fights with Bane.