Hi, Its usually rotavirus infection in this age.first i have to know weather your feeding the baby or its artificial feeding. Doctors usually don t recommend over-the-counter anti-diarrheal medicines for children. However, the doctor may prescribe an antibiotic for a bacterial infection or an anti-parasitic drug for a parasite infection. Your child s health care provider might recommend that you give your baby an oral rehydration solution (ORS). These solutions, which you can buy at your local supermarket or drug store, contain fluid and electrolytes and can prevent or treat dehydration. So consult your baby helath care provider to know any symptoms of dehydration and treatment.