I know tons of successful women who run businesses who are fine without having children; I also know quite a few who have children and are still able to run a business.
This whole argument goes back to the beginning of the feminist movement and people not being willing to hire women because they should be making some man sandwiches and popping out babies.
The trend is leaning towards more women having fewer children, if they are having them at all (http://www.google.com/search?sourceid=chrome&ie=UTF-8...).