Breast pain while breastfeeding a toddler can have several common, treatable causes. It may be due to a shallow latch, friction, plugged milk ducts, thrush (a yeast infection), or nipple vasospasms (constriction of blood vessels). For safe pain relief, you can use over-the-counter ibuprofen or acetaminophen, both of which are safe while breastfeeding. Applying warm compresses before nursing or cold packs after can also soothe discomfort. Please ensure your child's latch is correct and keep the area dry. I recommend consulting your doctor or a lactation consultant to identify the exact cause and discuss targeted treatments, especially if an infection is present.