Today my 3mo old Daughter started getting a runny nose, sneezing continuously, coughing, and trying…

Today my 3mo old Daughter started getting a runny nose, sneezing continuously, coughing, and trying to rub her eyes. She just went to the doctors on Tuesday and they said everything looks great but I'm starting to think she might be getting allergies to something? she's breastfed also and im not really eating anything in particular that could be such a switch up for her? Any input would be great ☺