Hay, mama, I understand you're worried, yellow spit-up in newborns can definitely feel scary, lalo na first time! Please bring baby to your pediatrician or go to the nearest clinic as soon as you can to have her checked, okay? Don't wait, better safe than sorry with these things. The doctor needs to see baby in person para malaman kung normal lang yan or may kailangan i-address. Sending you a hug, you're doing great by paying attention!