DS was sleeping through most nights, from 9pm - 9am by 3 months of age. I have no idea (honestly can't remember, it was that long ago now) what I did to achieve this- he was just a great baby! Hope I'm as lucky with this next one! He was formula fed, maybe that kept him fuller for longer? I've heard that babies who are FF will go longer between feeds? Hmm, planning on breast feeding this one if I don't have the same complications I had with DS feeding, so we'll see if it's true.