Most likely your daughter is suffering from acute gastroenteritis. Unless associated with bloody stools, the condition is self limiting. Give Pedialyte or ORS (Oral Rehydration Solution) and plenty of other fluids. Replenishment of the lost water and salts as the mainstay of treatment. Treatment is not supposed to bring down the frequency of passage of loose stools. The adequacy of the hydration would be evident from the frequency of passage of urine. If that seems to be fine, you need not worry. But unless the child grows lethargic, I would not get concerned. It may still take 3-7 days (from the onset) to stop. The excess moisture in the diapers has caused perianal erosions which are painful and hence the child screams while the diapers are being changed. Try to keep it open to air and apply Siloderm Mixi ointment. It should provide relief. You may give zinc supplementation with Zinconia Syr 5 ml twice daily for 5 days. It will help in the intestinal healing as the diarrhoea causes some damage to the inner wall of the intestines. It is preferrable to avoid milk and wheat based items for a week or so. But you may also give plenty of curd or yogurt. It contains plenty of beneficial bacteria, same as that contained by Bilfilac, and is supposed to be helpful in such a situation.