I know there is no scientific data that babies who take formula sleep longer/better....and that night waking is not related to hunger.....but did your baby sleep better once you started formula? I feel like anecdotally I have heard that so many babies slept better once on formula.
We started formula on Sunday for medical reasons and now my baby gets 50/50. Since Sunday he started sleeping through the night (7 hrs, then 8 hrs, then 9 hrs, then 9.5). Coincidence? Hmm. He's 4 months.