I have some mucus or postnasal drip in the back of my throat. no cough, no fever, stuffy nose, but my throats feels irritated. not sore because i eat and drink just fine. what could be going on? i have a newborn so i don't want to be contagious.

Wear a mask: New throat pain can be from a strep throat infection (antibiotics are needed), a cold or influenza (antibiotics usually not used), or from some other cause such as allergies or irritants. Usually, a person sees the doctor if the sore throat is bothersome, recurrent, or doesn't go away quickly (mainly to check for strep throat). A newborn is vulnerable to catching other people's infections.

Reflux?: Your symptoms are suggestive of reflux causing a sensation of mucus at your throat and post-nasal drips. Talk to your doctor.