Baby doesn’t like to sleep

The question:
My 7-week old daughter is a very active baby and does not like to sleep. The only way I can get her to sleep, either for a nap or at bedtime, is if she falls asleep while being fed (breast or bottle) or if I rock her to sleep, which often can take up to 2 hours. I don’t want either of these methods to become a habit, and was wondering how old she should be when I should start trying to get her to sleep on her own. Also, when the time is right, how do I get her to sleep on her own? – Ann Marie, Virginia