As jrroland suggested, why  not give Apollo a try? He makes a very convincing child. If you don't already have him, just click the banner in my sig.

Carodan has some great free ADS characters too, some of which are child specific. These can be found in the Free Stuff section here.

If we can hit that bullseye, the rest of the dominos will fall like a house of cards...checkmate!