Well we have switched formula and I haven't seen any drastic change- although it is a little early. I do have to say the first night on soy formula he slept awsome, only waking for a bottle once and he didn't wake at the crack of dawn but slept till 9am!! (although he did go to bed late due to church) Last night did pretty good too, a 2am wake for resettleing and 4:30 for a bottle. He did wake a lot in the am 5, 6 and 6:40- but eventually went back to sleep. Daytime bottle increase has yet to happen though.
