Future Thumb Sucker?

When Caroline was first born she actually put her thumb in her mouth on a few ocassions but then it seemed she stopped trying. Until recently that is. She has really began to work her hands over lately. It's like she knows there is something there to suck on, but she can't quite figure is out yet. As many of you know, her big brother is a thumb sucker.....guess we might have two of them on our hands.