Is it necessary to disinfect baby bottles this way?

Patient's question:

At two months old, I have been solely responsible for sterilizing the bottles at home. Today, without my child's grandmother knowing, she picked up a bottle I had just washed with tap water and gave it to the baby for formula. Since I wasn't present at the time, by the time I realized, the child had already started drinking. Now, what worries me is whether it's urgent for such a young child to drink from a bottle I had just washed with tap water. I'm also unsure if there are any remnants of tap water left in the bottle. I'm very concerned.
What kind of assistance would you like: I don’t know what will happen if the baby drinks tap water...

Doctor's answer:

It is recommended that you wait and see. Generally, after washing with tap water, it is absolutely harmless to consume directly. If there are any bacteria, they are only a small amount and will never cause any major issues. At most, they might cause the stomach to produce germs, leading to nausea and vomiting. Usually, stomach acid will completely eliminate most of the bacteria that enter the stomach. There should be no problem. You don't need to use any medication for now. You should also let the child's stomach recover gradually.

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