hi there, henry is 4 months old and for 4-6 weeks the df worked fabulously well. however, he started having plenty of nw's and sleeping fitfully, as he also started waking up when we went into the room for the df. so we have dropped the df, the first night he woke at 1 am and fed, the next two nights he slept through, although fitfully from 5am and now he wakes at about 5am and has a small feed to tide him over until 730. iMHO if the DF is disrupting their sleep, rather wait for him/her to wake out of her own accord. yes it was nice when we fed at 11 and he slept until 7, but the waking up the last week at 4-6 am with a crying baby who we knew didnt need a feed was painful. now things are better and his quality of sleep after the feed is great and he is flourishing.
hth
btw does she have any NW's after the df? or does she sleep through from the DF until the morning?