Weaning help

So, my baby is soon to be 12 months old. We’ve naturally started weaning. I haven’t done it intentionally, but he’s stopped night feeding on his own. I usually pump twice a day. Yesterday I only got 2 ounces in my second pump. I just did my 1st pump of the day and only got 4 ounces. So.... my milk is going away.

What I need to know is... what am I supposed to replace the breast milk with? Cuz I think I’m about to be out of milk by next week, lol, and I don’t know what I’m supposed to give the baby once that happens. (He usually drinks the pumped milk as soon as it’s done).