My baby is 16 days old and cluster feeds every night for anywhere between 2 - 4 hours. This is making my breasts sore to the point where I cry. She just feeds and has a bum change, feeds, bum, feeds, bum and so on. I am getting to the point where I am ready to throw in the towel and turn to formula. During the day her feeding pattern tends to be feeding every 3 hours or so. What can I do to stop this cluster feeding before I do admit defeat and turn to the bottle and formula? 