how old onwards do you wean baby off mid-of-the-night feedings? my bb is now coming to 6months old in a few days. she still waking up for night feeds 1~2 times

You can offer extra feedings in the evening. If she goes to bed with a full tummy, she's less likely to wake up hungry in the middle of the night. You may even want to wake her for a final feeding or "dream feed" before you go to bed yourself.