I'm sure all children do this finger to the mouth thing, but mine especially do -- it's pretty funny!  I guess in the second one Jack looks like he's going to pick his nose, but if we caught him the second before or after, I think it would have looked just like the top photo of Kathleen.

Their little fingers and noses are so SIMILAR!  I think it's striking how alike Jack and Kathleen look despite their drastic differences in coloring.