Bad milk

Accidentally fed my little one bad milk (less than 1 oz) as I can’t breastfeed him. I was in a meeting (work from home) while hubby is caring for him. He’s not showing any signs of discomfort but I am worried. I already fed him BM hoping it will fight bad bacteria caused by the bad milk (Or something to that effect). I’m even hoping he would throw up but he’s asleep now.