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The baby can be continued breast feeding. You need to give WHO ORS
which is standard treatment for diarrhoea
water loss. Buy the sachet, and dissolve it in 1 litre of pre-boiled and cooled water and give in sips to drink in clean spoon. Avoid giving anything else to baby, not even water, honey, gripe water etc. Only breast feeding is must. If this does not help and baby is weak, sleepy and not feeding properly then he may need IV fluids in hospital Usually it is viral infection and does not require antibiotics.