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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.Having a history of fever, diarrhea, loss of appetite, inflammation or infection in the gum are due to a infection.Most often these symptoms are due to viral infection which does not need antibiotic.But sometimes after a viral episode, bacterial infection can develop.As it is going on for 8 days, he is not taking food, having weight loss and still now and gum is red, inflamed, please take him to his pediatrician again.Doctor can examine him, if it is needed he can prescribe antibiotic.Oral yeast infection can be given.Yogurt can be given.Doctor can prescribe vitamins if it is required.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish him healthy life.Regards.