Night feeding

Hi mummies. Is it normal for baby at 4 months to drink only after 6/8 hours? My baby drink sometimes as little as 120ml to 210ml. I’m scared I’m under feeding at the same time over feeding. Pls advise I’m worried. Also, he usually sleeps and only wake up and cry when he really want milk. I used to have a lot of wastage because he didn’t really want to drink at night. (Formula fed)