What to do when the baby refuses to breastfeed?

Breast milk begins to form during pregnancy, at the very beginning of the second trimester. The mummy's breasts are ready for the baby right after the baby's birth. Breastfeeding is, indeed, a beautiful and rewarding experience, but it can come with difficulties. In fact, plenty of them. Newborns can have problems latching on or learning to breastfeed, even older babies, who have been breastfeeding well for weeks or months, suddenly stop. Why?