My DD started sleeping alone in her own room at 6 weeks. By 7 weeks she is mostly sleeping through the night only to wake at 3 and 5 for feedings. Now she is 12 weeks and sleeps from 7 pm to 5 am every single night. I have an excellent camera system and can see her in perfect detail. We have trouble with naps if I want to set her down but nights are never a problem.
Bragging? No. Curious as to what you think and how you did it? Yes.