Still two bottles a night at one year old. How did you drop the night ones?

Writing this after the 1 o'clock one. He wakes for milk around 1 and again near 4, drinks the whole bottle and goes straight back to sleep. Daycare says he barely touches milk during the day. My partner and I take turns, but we'd both like a full night before the year is out. Did you cut down gradually or stop at once?