Many folks believe that formula fed babies sleep through the night earlier than babies who are exclusively breastfed. The idea is that breast milk digests easier and baby is hungry sooner. It makes sense. However, interestingly, moms who formula feed do not necessarily sleep better than moms who breastfeed. This is according to this one study in the journal, Pediatrics.
None of my kids so far have been great sleepers. #1 did not really sleep through the night until she was almost 15 months! #2 took about 12 months. I'm hoping #3 will be sleeping through by 3-6 months. Right now, I just want him to stay asleep in between feeds... I can handle 2-3 hours of sleep at a time but waking up every 30 minutes is too painful (thankfully that only happened one or two times).
