Funny how the Infanta is exactly the same pose now as she was yesterday when I posted. Yes, Amy, complete with thumb in mouth - she's a real thumb sucker, for which her father and I are profoundly grateful. My in-laws may make remarks about how hard it will be to break her of that habit later, but I don't care. First off, I figure she'll stop when she's ready, much as I stopped sucking my two fingers when I was ready.
Second, Josh and I MUCH prefer a kid sucking their thumb to a kid who walks and talks and has a pacifier clipped to her clothes! Or worse yet, talks through her pacifier!
Third, it's not like she's always got her thumb in her mouth; she uses it as a boob substitute, mainly. If she's awake and sucking her thumb, usually it's because she wants to nurse, and is a good signal to me. If she's asleep and I'm done being a milk machine, I'll detach and she'll often promptly replace nipple with thumb. She just needs to suck, and it doesn't always need to be nutritive. Witness now - she's deeply enough asleep that she lacks the muscle tone to keep her hand up, but her mouth is still moving in a sucking rhythm.
I don't mean this for an indictment of moms whose kids use pacis for extended periods - or not much, anyway - me, I never intended to use them at all! I do well know, and learn better every day, that in parenting, as in the rest of life, theory ad reality often bear little resemblance to each other.