The last few nights DD, who is 4 months, has been difficult to settle in the evening, but will still sleep 8 1/2 - 9 hours from 11pm. Today she's only had short naps and has woken from every one crying. I'm pretty sure it's her "I'm in pain" cry too. Tonight I noticed her lower gum is white and she is chewing on her fists and my fingers a lot. Could it be teething already?