Aduh, yang yellow discharge tu likely blocked tear duct or infection, better check with doctor soon okay sebab mata baby sensitive and 45 days pa lagi. A few of my mum friends had this, one kid kena eye infection and kena antibiotics, but the eye doctor confirm dulu apa exactly. Air conditioning room should be fine, tapi make sure not direct on her face lah, and mata baby need keep clean. Jangan delay the check-up ya, better safe than sorry with newborn mata!