my baby is 18 months he got loose motions many times after 12 months , in 13th month he got severe loose motions but no fever after giving antibiotics for 5 days loose motion continued.in 16th month he got indigestion n loose motions again gave antibiotics n this time it worked now again from last week ,he is having loose motions had fever as well for 2 days antibiotics done for 5 days still stool is loose ,could it be change of water infection or excess milk intolerance