Honestly, I'm not entirely sure kung anong specific term yan, but sounds like you might be talking about either jaundice (yung yellowish tint) or maybe just the natural newborn skin na medyo greenish-gray pa lang? Ang aking firstborn ay ganyan din at nag-alala ako, pero normal lang pala yon habang nag-adjust ang skin nila sa mundo, lol. If your baby's skin is looking greenish and you're concerned, better to ask your pediatrician just to be safe though, they can tell you right away kung normal lang or may need ng treatment!