It is very important that your son does not have any food in his stomach when he goes in for the op. This is becuase he may vomit and breathe in some of the food in his stomach which is dangerous.I am not quite sure of the time lines in your question. Do you mean that you want to give him a liquid food supplement at 1am on the morning of his operation? This is not advisable as it will take several hours to be digested.
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