The baby has been diarrhea water may be improper feeding, lactose intolerance, pediatric diarrhea and other causes, you can change the way of feeding, replacement of dairy products, medication to improve the symptoms. 1. Improper feeding: feeding the baby formula is too thick, the milk powder is not suitable, the milk is too cold, these improper feeding may lead to the baby has been diarrhea and diluted water, feeding the milk powder should be in accordance with the normal concentration of the preparation, choose the right milk powder for the baby, brewing milk powder at the right temperature. 2. lactose intolerance: the baby has been diarrhea and diluted water may be lactose intolerance, the reason is the lack of lactase enzyme or lactase enzyme activity is low, drink or drink milk and other dairy products can not be fully digested and absorbed food in the lactose triggered by diarrhea, this kind of babies can drink non-lactose milk powder, lactase preparations, bifidobacteria and other drugs may improve the symptoms. 3. pediatric diarrhea: baby due to bacterial infection, viral infection, poor diet and other factors caused by pediatric diarrhea diarrhea, can be under the guidance of the doctor with such as amoxicillin, bifidobacteria, lactobacillus acidophilus, montelukast and other drugs to improve the symptoms. The baby has been diarrhea dilute water causes more, it is recommended that timely medical treatment, the above drugs need to be used under the guidance of a doctor, parents should not blindly give the baby medication.