Your child could be suffering from acute gastroenteritis. Unless associated with bloody stools, the condition is self limiting and does not need to be treated with antibiotics. You need to give ORS (Oral Rehydration Solution) and plenty of other fluids. It comes in ready made form or may be prepared by mixing a full sachet in the designated amount of water. Replenishment of the lost water and salts is 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. You may give zinc supplementation with Zinconia Syr 2.5 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 and is supposed to be helpful in such a situation. If the child has cough and cold additionally, giving some antiallergic like cetirizine 5 ml once daily for a few days should be helpful. You may also give steam inhalation.