When did they find their thumbs? DD is 10.5 weeks and has been stuffing her hands in her mouth for a couple weeks, trying to get that elusive thumb. Lately, though, she's been getting SO MAD that she can't get her thumb! I don't particularly want her to suck her thumb, but if she's determined to do it I wish things would just "click" already! It kills me when she screams and I know what she wants but can't really do anything to help (sometimes she'll let me sub in the pacifier but usually she just shoves it away and screams at her hand).