Thumb sucking now?!

​My daughter is 5 and has just now started a sucking fixation. Her thumb, her index finger, a toy. . .she has never done this before. She never took a passy, she was breastfeed so no bottle. There has been no abonormal things going on in our lives so I don't know what the trigger could be. I have asked her and she just tells me that she likes to suck on things. She says with her fingers she likes to bite them to see the mark it makes on her skin. I don't know if this is normal and if I should worry.

About Kristen
Birth: December 31
On since: Nov 11, 2013
I had my first successfull pregnancy in 2008 and now have a wonderful 5 year old daughter
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