Colostrum: This is known as pre-milk, which is a sweet and watery fluid that is easy to digest. During your second trimester your breasts will begin to produce colostrum. Colostrum appears thick and yellow at first and as birth draws near it becomes pale and almost colorless. Colostrum will provide your baby with his first few meals before your milk comes in. Discharge may occur at any time, when your breasts are massaged, or when sexually stimulated. There is no need to be alarmed when this happens and there is no need to worry if it does not happen. Women who do not experience discharge in pregnancy still produce and provide milk for their baby.