I disagree. There is no reason to bring up children on your first or even second date. At that point, its none of her business. She's still a stranger, and you don't tell strangers about your personal life. And kids are as personal as it gets.
Congratulations, you just won the dumbest post of the year award.
That's the first thing you/he should talk about. Not everybody wants to deal with kids, or people with kids for that matter. You have no right to waste people's time.
That's no different than lying.