Three monthly morbidity visits are conducted by a field investigator to obtain information on the hospitalizations and their causes in the last 3 months, healthcare provider visits in the last 1 month, illnesses for which these were made and severity of these illnesses, diarrhea and respiratory morbidity in the previous 24 hours, week and month. If the infant has been hospitalized in the last 3 months, a hospitalization form is filled to ascertain the reason for hospitalization. In case of deaths, an interview is conducted with the caregiver and a verbal autopsy form is filled.