Milk is produced after the third trimester of pregnancy, when the placenta has formed and many estrogens, progesterone, lactogen and oxytocin are secreted in the ovaries. However, during pregnancy, breast milk is not significantly discharged because the body is suppressed by estrogen. After the sixth month of pregnancy, a yellowish discharge, or a small amount of milk, is produced when you press on the nipple. Breast milk during pregnancy is usually accompanied by a feeling of breast swelling, which usually occurs in pregnant women with larger breasts who are physically obese. It is important to take good care of your breasts during pregnancy, pay attention to hygiene, and not wear too tight underwear. Reserve breast milk during pregnancy should be more nutritional intake, more high-quality protein, vitamins and other nutrients, more from fish, meat, soy products, shellfish, fruits and vegetables and other foods.