What is Normal? It is normal and expected for your breasts to become larger and to feel heavy, warm, and tender between the third and fifth day after your baby is born. These breast changes are due to an increase in milk volume as well as an increase in blood and lymph fluids flowing to the breast. The changes signal the "incoming" of your more mature milk, and are a positive sign of good breast function.
Breast Engorgement Causes, Treatments, and Complications
Breast engorgement - Wikipedia
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When you first start breastfeeding your baby, your breasts produce colostrum in small amounts that gradually increase over the first few days. One of the signs milk is coming in is your breasts become fuller and firmer. This swelling is not just caused by the greater quantity of milk, but also by increased blood flow and extra lymph fluids in your breast tissue.
Usually 2 to 5 days after your baby is born, you will notice changes in your breasts. They will get larger, somewhat firm, and slightly tender as they start to make more milk. This is called postpartum breast engorgement. Engorgement is normal. However, the swelling of your breasts may make it hard for your baby to get milk.