Neonatal Breast Enlargement

An 8-day-old girl presented with bilateral breast enlargement. She was born at term; the 1-minute and 5-minute Apgar scores were 8 and 9, respectively. She was feeding well and showed no signs of discomfort or irritability. Examination of the chest revealed enlarged breast tissue with no evidence of tenderness or discharge. The mother noted that the breasts were slightly swollen at birth and continued to grow larger during the subsequent days. Neonatal breast enlargement is a normal response to falling levels of maternal estrogen at the end of pregnancy, which trigger the release of prolactin from the newborn's pituitary. Neonatal . . .