diarhea

My baby has diarrhea once a day for the the past 10 days but still has his normal 8 wet diapers and no fever, no dehydration, congrstion or anything. This diarrhea diaper is the only poop he has every day and its not excessive. He farts a lot his pediatrician says babies just are gassy and I had to do my own research and got gas relief drops. Why would he have diarrhea? He is formula fed (cows milk). His pedetrician is no help.