hello there,
my granddaughter had this problem and it turned out a mixture between teething and a bug...the diahorrea was terrible it shot out of her so was change of clothes as well as nappy,s..
we took her to doctor to have her checked as we worried for dehydration..she was happy enough the wee soul but mum,s shall be mum,s..
get baby checked out your doing everything you can but this has went on for too long..
my granddaughter went for nearly 8 days but was prescribed antibiotics and it cleared in no time..
hope this helps you and baby gets well soon.