Most babies can breastfeed regardless of the shape of your nipple.  Inverted or flat nipples can sometimes make it difficult to get a deep latch. However, you should remember that your baby must latch on to the entire nipple and the areola in order to breastfeed. This means that even nipples that aren't a normal shape will work, and often the nipples protrude more over time as you continue to breastfeed.