Breast milk is basically milk produced by the breasts of a human female. Newborn babies generally require breast milk as a primary food source not long after birth. This lactation or "suckling" phase lasts until they are old enough to eat solid food. It also called breastfeeding. Breast milk exits out of the breast through the nipples or "teat" of a woman. In some cases, a woman may pump herself (extracting the milk by pumping her nipples) in a similar manner to how cows have their milk extracted in modern methods. That way, they can avoid breastfeeding their child by instead giving them milk that has already been extracted.