Girls, my daughter is 1 month old and got sick. I got sick myself from…

Girls, my daughter is 1 month old and got sick. I got sick myself from the air conditioner, phlegm, throat. After a day, the baby has phlegm, nose blocked. But she eats well, sleeps. She doesn't cry. We just rinse her nose with Aquamaris and drip milk into her nose. Have you encountered something like this? How did you manage?