**Core Concept**
Bilirubin levels in newborns are a critical indicator of jaundice, which can be caused by various factors including breast milk jaundice, physiological jaundice, or hemolytic disease of the newborn. In this scenario, the baby is full-term, breastfed, and has a bilirubin level of 14 mg/dL, which falls within the normal range for a breastfed infant.

**Why the Correct Answer is Right**
In breastfed infants, it's common for bilirubin levels to peak between 3-5 days of life. The American Academy of Pediatrics (AAP) guidelines recommend phototherapy for bilirubin levels above 15 mg/dL for full-term infants. However, in this case, the bilirubin level is 14 mg/dL, which is still within the normal range for a breastfed infant. Additionally, the baby's weight (2,700 g) is appropriate for gestational age, and there's no indication of hemolysis or other underlying conditions that would require further intervention. Therefore, normal newborn care is the most appropriate course of action.

**Why Each Wrong Option is Incorrect**
**Option B:** Phototherapy is not indicated in this case as the bilirubin level is below the threshold for treatment.
**Option C:** Exchange transfusion is a drastic and unnecessary measure for a bilirubin level of 14 mg/dL.
**Option D:** Stopping breastfeeding is not necessary, as breast milk jaundice typically peaks between 3-5 days of life and resolves on its own.

**Clinical Pearl / High-Yield Fact**
For breastfed infants, bilirubin levels should be closely monitored between 2-5 days of life. If levels exceed 15 mg/dL, phototherapy may be necessary. In this scenario, a bilirubin level of 14 mg/dL is within the normal range, and normal newborn care is the most appropriate course of action.

**✓ Correct Answer: A. Normal newborn care**