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It is possible that the antibiotics are causing the diarrhoea
because most antibiotics have that potential side effect.
Other common causes of diarrhoea would be a viral or bacterial infection of the bowel.Viral infections are more common than bacterial causes.
The important aspect of treatment in any child with diarrhoea or vomiting is fluid management because children can easily become dehydrated.
Since he is passing stool so often , you may want to have his general health and hydration status assessed .
Signs and symptoms of dehydration
would be decreased urine output ( a decline in the number of wet pampers), dry skin, crying with no tears, excessive drowsiness
, increased heart rate
, skin tenting (if skin pulled up , remains so because of lack of fluid), mucous membranes (eyes) appear dry, tongue appears dry.
Normally you need to give fluid to replace what he is losing as well as maintainance fluid. Each time he has a loose stool
he is suppose to be give fluid to replace the fluid he is losing.
It would be best to have him assessed and the amount of fluid he needs calculated.