@Malkovik: actually, milk letdown starts a few days after the mother gives birth, so it's normal for her breasts to stay the same volume if she's still expecting.
Base +12, Guld und Silber +6, beandogs +2, Ashark +6
@Ammendum Actually, breast enlargement during pregnancy starts well before milk comes in. Early pregnancy (often 6–8 weeks): Rising estrogen and progesterone cause the milk ducts and milk-producing glands to grow. This makes the breasts feel fuller, heavier, and often more tender. Throughout pregnancy: Fat stores increase, blood flow to the breasts rises, and the glandular tissue continues developing, so breast size often increases by one or more cup sizes. After delivery the mature milk supply typically "comes in" 2–5 days after birth "I have been known to dabble in the occasional impregnation fetish. I wouldn't test me on that, sir."