I don't know how old your bubs is so this may be irrelevant! My daughter didn't sleep thru the night until a couple of months at about 19mths. I tried all the common approaches but nothing even helped! We then went on a trip to Tassie where she got to meet her 3 young cousins. She had such a good time that any sleep patterns that i did have went out the window, late nights no day sleeps etc.
The miracle to this story is that the day we got home she was so exausted she slept thru the night! As it took a week or so for her to catch up she had now created new habits and to this day she now sleeps 12hrs every night!
We believe that her waking up every 3-4 hrs for the first 18mths was just a habit as i kept trying to pacify her and she would expect the attention!
DD5, DS3, DS lost to SIDS at 6mths & DD6m