Brandy,
I used sleep training from the beginning... baby whisperer style. It worked like a charm. Tracy always said "Start as you mean to go." If you do not have her books, I would suggest getting them and starting sleep training now. It takes time, but by using her methods, you do not let your little one cry for no reason and you still achieve the same goal. I hope you will give it a chance, the baby whisperer's methods worked wonders in my house. I know all babies are different, but we started at the beginning and my ds who is 7.5 mo. old now has not eaten at night since about 10 weeks old and slept through the night at 12 weeks old. We do hit bumps now and again, but for the most part, he learned to sleep and fall asleep on his own and I never left his side.
If you have any questions along the way, let us know!
Jennifer