Spoiled milk: Once you mix powder formula it is good for about 2 hours at room temperature and 4 hours in the fridge. When the baby's milk mixes with the stomach enzymes and acid and then comes back up it may appear curdled or have a sour smell. This is normal. Sometimes it helps to keep the baby propped up for about 30 minutes after feeds so he/she will not spit up as much.
Answered 4/16/2016
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