Ay, mama, please have baby checked by the doctor as soon as possible, kahit kaagad, yellowish skin sa babies needs to be looked at right away, hindi ito something to wait on. Jaundice can happen, but only the doctor can tell kung okay lang or kailangan ng treatment. One of my mum friends had the same worry, and good thing she went in immediately kasi the doctor helped right away. Sunlight helps, yes, but kailangan talaga ng doctor's eyes on this one, okay? Tawagan mo na ang pediatrician mo or mag-walk in sa nearest clinic, better safe than sorry with our babies!