It is very unusual for babies of this age to develop a sore throat. It is possible that your baby has a virus infection causing ulcers in his mouth which is why he won't eat. It would be best to take him back to his paediatrician and to inform him of the problems you have had trying to give the antibiotic [which will not help for a virus illness anyway]
He should have another look at your baby so that you know exactly what the diagnosis is and also make sure that he is not becoming dehydrated because he is not drinking.
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