There are 2 possibilities with his watery stools, either he has a lactose intolerance or he has picked up an infection such as gastro-enteritis. He is very young to have such an infection. I am concerned that he has thrush at the age of one week. I suggest that he is seen by a paeditrician as soon as possible in order to decide exactly what is causing this problem. It may be necessary to repeat his tests for immunity.
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