When does your baby sleeps through the night?

1st bb - slept through around 5 mths. keep on brainwashing him before his sleep. tell him no milk even if he wakes up in the middle of the night. I feed more at 11 plus pm n he can sleep till 5 plus am. as he grew older around 10 mth, sleep trained him sleep at 9.30pm n wake up 6 plus am. now 22 mth sleep from 9.30pm to about 8am. all without night feeds. now 2nd bb 2 mths. feed about 120ml around 11.30pm n sleep till 4plus am. slowly dragging his midnight feeds