The first few times this happened I thought that Sery grabbed my hair on accident while she was sucking her thumb. But last night she was doing it and I realized it was on purpose. I took my hair away from her and she would grab it again and stick her thumb in her mouth. She doesn't like to suck on my hair, she just likes to hold it while she is sucking her thumb. She loves my hair. She loves to play with it and feel it in her hands. Many times when I am holding her she will have her thumb in her mouth with one hand and the other hand will be clinging to my hair. She is so sweet.