My DD started sleeping through the night a week or two after she turned 4 months. I had done the DF but dropped it and all night feedings per my pediatricians recommendation. She did well. She occasionally needed her paci reinserted or to be reswaddled, but would drift right back off on her own so it took us 2 mins. tops. Also, once she learned to find the paci herself, we were off the hook. She did go to bed around 7, 7:30 the latest, but still took 3 naps and a catnap. Now at 6 months she takes 2 naps and sometimes a catnap, depending on how her other naps went. Don't get me wrong, we still have strange night wakening occurrences, growth spurts, got off track when visiting or some other situation, but for the most part, she could do the 12 hours at night. (Although, now she does seem to wake up a bit earlier, although she tends to coo and entertain herself so I can usually get a bit more sleep)
Hope this is helpful.
Best of luck.