It can be a rotaviral diarrhea
. This usually presents with fever
and watery stools
It may last upto a week.
Be sure he drinks well so that he does not get dehydrated.
Continue with the medications.
You may try to give boiled rice water/ Boiled Dal water if he likes.
For the rashes- do not wipe the area hard, do not apply diapers, just mop the area gently with wet cloth after each loose stool
. You may apply Siloderm ointment in that area.
If he does not drink/ he passes urine less than 4 to 5 times a day/ develops high grade fever do not hesitate to contact your doctor again.
Wish a speedy recovery for your kid.