During lactation, progesterone and other reasons will stimulate the chest to become bigger, and the hormone level is relatively high when I was a child. After giving birth to a child, the hormone level will drop, the chest will become smaller, and the chest skin will sag a little. This is normal. If you want to improve, you can have surgery and take medicine, but I suggest personal treatment, that is, massage and touching. If you touch, I suggest your husband help you, and heterosexual stimulation will slightly increase the hormone level.