After pregnancy nipples appear to have small particles, this is a normal physiological phenomenon. As estrogen and progesterone increase in the female body after pregnancy for the following reasons: on the one hand, it will promote the enlargement and softening of the uterus, and on the other hand, it will also promote the growth and development of the mammary glands, and small granules will appear around the nipples, which are also called Montgomery’s nodes. And the nipples will also increase in size, and in the later stages of pregnancy the nipples will produce a small amount of milk. The biggest changes after pregnancy are the changes of the uterus and breasts. The changes of the uterus are due to the gestation of the fetus, women should strengthen the maternity examination, while the changes of the breasts, usually do clean care, wear loose underwear, avoid the breasts from being squeezed, and fully prepare for the breastfeeding after delivery. If the breasts are poorly developed or squeezed, milk secretion will be affected in the postpartum period.