If there is no fever
and stool is not mixed with mucus or blood antibiotic is of no use. Stop giving antibiotic. Losse motion in this age group is a very common problem as there is a change in diet pattern. Get a stool test
done for reducing sugar to see whether he is suffering from lactose intolerance
or not. Transient secondary lactose intolerance is common following diarrhea
Give her Zinc syrup and probiotics for early recovery.
Maintain hydration by giving ORS and frequent feeding. Observe for danger signs like blood or mucus in stool, vomiting
, poor oral intake or decreased urinary frequency. If you notice any of these consult your doctor immediately.
Also start complementary feed like khichadi, dalia, sooji kheer, dal, mashed potato, babana etc.
It take usually five to seven days to recover from diarrhea. So just maintain the hydration and be watchful for danger signs.