I know, its not good for her teeth. I know as a mother, and from experience. I sucked my finger until I was 8 years old. I remember my mom trying everything to get me to stop. And, like any true addiction, I only stopped when I was ready. When I realized, sitting at story time in Mrs. Larson's 2nd grade class- I was a little old to be sucking my finger............. I paid for it with braces TWICE. Awesome.
With Jessica, I was so scared she's suck her thumb or finger. I pretty much forced the binky on her. But Izzy? Yeah, she wouldnt' let me. She wouldn't take a binky for the life of her. When she kept refusing the binky, I WANTED her to take her finger, to at least give my poor boobas a break from being her 24/7 soother. But nothing for the first 3 months.
Then, all of the sudden, she discovered her thumb. And the binky. It was like all of the sudden she realized she could suck on things other than mommy. When I laid her down to sleep, she realized she could pull her left thumb into her mouth to soothe herself to self. Just a few weeks later she realized that the right thumb worked just as well.
I tried the binky, I really did. The only one she ever really took are those big ole green ones from the hospital. And she takes it, but when it falls out, her thumb is in her mouth. She's now gotten to a point where I just start to lay her down and her thumb goes strait to her mouth.
Oh well, I may be paying for it in orthodontic bills later in life, but at least I'm sane now!