Newborn Not Pooping?

Is it normal for newborn not to poop for 2 days? Baby currently 1 week old, having formula every 2-3 hours (Similac infant 2'-FL) Previously was mixed feeding between breastmilk and formula till 3-4 days old. Decided to go full on formula Baby currently have some jaundice issue as well. Any ways to make her poop? Her last poop was 25/1 at 5pm (also after 1.5days not pooping). Its 27/1 4pm now and no poop ever since that evening. So worry now