It is normal for milk to flow during the fifth month of pregnancy. During pregnancy, the placenta will secrete estrogen and show milk secretion, and also show enlarged breasts, expanded milk ducts, darker and wider areola, darker nipples, and granular secretions, which are normal and do not require special treatment. During this period try to pay attention to hygiene and cleaning, wear loose cotton underwear to reduce the stimulation of the local skin is also conducive to blood circulation, if you wear underwear too tight will affect the blood circulation, resulting in breast swelling and pain or stinging more obvious symptoms. During pregnancy, you should pay attention to rest, do not overexert yourself and do not bump violently, otherwise it will aggravate the feeling of breast pain.