Three kids, and each had/s a different way to comfort themselves.
Clare went with her index finger, a derivation of what Tim used to do:
Danny opted for his thumb, as did his mommy before him:
While Laura chooses the entire forearm. This really makes me laugh, but my mom says she used to do the same thing. It strikes me as more dramatic, which is so far in keeping with Laura's personality. At least, as a baby - Danny's not exactly deficient in the drama department.