How to Handle Diarrhea and Cold Symptoms in Babies Every Two Months?

Since the baby was four months old, she has been experiencing diarrhea and cold symptoms every two months. Now, at seven and a half months, she has caught a cold again, accompanied by severe nasal congestion, coughing, and runny nose. She has already received treatment, including vaccinations and medication (including drugs containing rimantadine), but the cold symptoms persist. How should this situation be handled?
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