Enlarged mammary glands in newborns may be due to hormonal changes in the body, this is a normal phenomenon, it is recommended to closely observe, if it does not subside in time to go to the hospital immediately. Enlarged mammary glands in newborns are mostly due to hormonal changes in the body after leaving the mother’s body, resulting in enlarged breasts. This is a normal phenomenon that requires close observation by parents. If it subsides and there are no other uncomfortable symptoms, it is normal. If the newborn’s enlarged mammary glands do not subside in time and are accompanied by other uncomfortable symptoms, it is recommended that parents take their newborns to the hospital in time to find out the cause of the enlargement and get prompt treatment.