It's not anti-child, it's anti having your rental property trashed. As someone whose family owns a number of rental properties, people with small children are often the worst. That's not to say you are, but some landlords have been burned enough so they don't want to rent to anyone with kids. It's their property-they can do what they want with it! You would probably have much better luck renting at a complex. Most of those rent to everyone and have firmer regulations in place, which can really work to your benefit.
In response to your Swh: the parents are certainly not controlling their kids, but it's the kids doing a lot of damage-holes knocked in walls, broken windows and appliances, plumbing nightmares, bathtub and sink overflows, scratches and tears in carpeting and on flooring-the list goes on! More often than not in our experience kids=damage. I'm not saying that is YOU or your daughter, but landlords learn after a few times so they adopt an across-the-board policy. I'm J. trying to explain to you why they won't rent to you. It's not because they're child haters or mean or out to get you. Yes, sometimes adults cause the same problems but usually not as many as children.