My daughter has 26 days complaining of skin rash, napkin dermitits, abdomen colic, diarrhea, and severe crying. what the appropriate treat?

Colic: Can be multiple reasons for the irritability,whether its from the skin issues or GI issues. Might be allergic to the breast milk/formula. Should be tested via a stool sample for blood. Depending on what the rash looks like would dictate what to do for that. Baby should be seen by their doc.

Milk protein allergy: Is your child 26 days old? The symptoms are suggestive of milk protein allergy. Consider a hypoallergenic formula. Treat rash symptomatically with triple paste diaper cream