My baby girl who will be 1 on the 13th still does not sleep through the night. She used to be the best sleeper and would sleep all through the night and even sleep in the mornings up until she turned about 5 months. Now she wakes up once or twice in the night just crying. Sometimes she goes back to sleep on her own but most the times I nurse her back to sleep. Is there something I should be doing?? How do I get her sleeping through the night again??