My dd used to sleep through the night until we went on vacation this summer. There, she developed a cold and slight ear infection. She would wake up a couple of times during the night and I would also nurse her back to sleep. But when we returned home, she was no longer sick but continued to wake up a couple of times in the night. At first I would go into her room, pick her up and give her the pacifier. I had to use PU/PD until she go the picture that it wasn't time to eat. Soon, it was down to only one night waking. Then I read in Tracy's book that sometimes babies wake up during the night because they are hungry... why? because they don't get enough calories during the day. So I upped her ounces from 6 to 8 plus I 'cluster' fed her later in the day like the book says... I give her milk at 4:30-5pm and then some cereal or milk again at 6:30. And u know what? She is back to sleeping through the night! Try it! Good luck!