Colostrum (the 'first' milk) begins to change to mature milk during the first week and this is often referred to as the milk 'coming in'. Your breasts will be swollen with extra fluids and, initially, you may be making more milk than your baby takes. At this time, your breasts may become hard, lumpy and painful. Frequent feeding helps to avoid this and expressing a little milk before putting the baby to the breast can also help. A warm bath, or warm flannel held to the breast, will help the milk to flow easily and make expressing easier.