Re: Seriously worried - Thumb sucking covering hunger cues?
eh. it's probably fine, and it's probably a fluke (hate to tell you!) there are a lot of 3 month olds who sleep "through the night" like that, so as long as she's gaining well, nursing on demand the rest of the time, and having enough wet diapers, enjoy the sleep! things'll change again soon enough, too.
also be aware that nursing is no longer good birth control for you now ...
Nursing, pumping, cloth-diapering, babywearing, working professor mama with the awesomest SAHD ever.