Thank you for the query.
Every diarrhea which lasts longer than 48 hours needs to be diagnosed with stool test
and stool culture. The most common reason of diarrhea in this age is viral or bacterial infection. Blood in stool
or undigested parts of food can be also present in the stool.
Other reasons like food allergy
or gluten intolerance should be also considered.
level can be checked with mouth dryness
, low amount of urine (less than 500ml/24 hours).
I suggest you to visit your doctor and have mentioned stool tests performed. Blood work, CRP and abdominal ultrasound should be also done.
Hope this will help.