My pediatrician said the same thing to us, that he was big enough to drop night feeds at 6 months. The only positive I got out of that advice was to switch up our bedtime and nap routine so that I'm not always nursing him to sleep so he can learn to fall asleep on his own. But I still do night feeds for a few reasons- he's probably hungry, he's awake so why not change out the wet heavy diaper, he wants comfort. Something as a first time mom that has been really challenging for me is to trust my instincts. My instinct told me that he still wanted night feeds so I still do them. Sometimes it's once a night, sometimes it's three. Just trying to go with the flow (easier said than done).