A 3-day-old newborn is brought to the clinic by her mom for…

A 3-day-old newborn is brought to the clinic by her mom for her first exam after being discharged from the newborn nursery. Mom is breastfeeding and notes that her milk “just came in today.” The baby has had two small meconium stools in the past 48 hours and has had “about 3 or 4 wet diapers yesterday and today.” When examining the newborn, the pediatric nurse practitioner notices the newborn is jaundiced just past the nipple line, about half way to the umbilicus. Mom states that the baby “looks more yellow today than she did yesterday”. What should the pediatric nurse practitioner do?