During pregnancy, breast enlargement occurs and this stretches the skin envelope of the breast. When pregnancy and nursing are over, the tissue within the breast involutes or shrinks, usually to a smaller size than it was originally. However, the skin remains slightly stretched and the smaller amount of breast tissue falls to the bottom of the stretched skin envelope. The result is usually a breast with somewhat loose skin, and a lack of fullness in the upper portion. A breast lift and/or a breast implant procedure can correct this situation.