Frequent loose motion
with wet perianal area predisposes to nappy rash.
Keep the area dry by gentle wiping after each stool. Apply diaper rash cream
4-6 times a day.
Give him Zinc syp. and probiotics.
Give him ORS
and plenty of fluid to prevent dehydration
If stool is mucoid then some antibiotic/antiamoebic may be needed.
If he becomes lethargic or has poor oral intake, consult your doctor immediately.