My Baby Is 8months & He Has Loose Motions From

My baby is 8months & he has loose motions from last one week whatever he eats immediately after 5 mins he is passing the stool. We did the stool test & it shows the pus cells are plenty and my ped told me not to give him milk neither cow milk nor mothers milk. My concern is he is nt sleeping without bf & I never gave him top feed so he is not used to that plz help me answering my question.