Unsure about cows milk and cereal?

Cece • Cecelia wyatte

Hi there! I'm a ftm soon to be a stm my oldest is a year old and he's been drinking cows milk with cereal in the bottle right before bed to help him sleep a little better with a fuller belly so I'm curious he didn't finish his bottle tonight and has 5 oz left in it and I hate to waste is it okay to keep it in the fridge until tomorrow morning?

Someone please help me out I've heard it is okay some places and others it isn't i don't know what to do!!