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in infants could be viral or bacterial or many other causes.The curative treatment for each is different.So its best to get a stool routine test done and consult your pediatrician
who can start treatment according to the diagnosis.But the major risk in any diarrhoea is dehydration
which is dangerous for kids .So giv ve your child plenty of fluids or oral rehydration solution , round the clock.
You may also give multivitamin-zinc based syrup for better relief.please do visit doctor immediately if child is having refusal to feed, lethargy
or decreased urine.