I am very concerned about your baby.Once he has a bloody diarrhoea it is known a dysentary.He has been ill for over 2 weeks and is not getting any better. The last thing that is causing this is his teething so ignore that completely. This is not due to a rotavirus infection either as he has been ill for too long. Food allergy especially a problem called cow's milk intolerance or a condition called eosinophilic gastroenteropathy are possibilities but he has not responded to being put on a soya formula.
Your paediatricians should have sent off a stool sample for culture as he may have an infection due to bacteria such as salmonella, yersinia or campylobacter.Please get a second opinion as soon as possible.He should not been on any medication other than the electrolyte solution until you know for sure what is causing this illness.
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