This has been a habit for a good 3 years now. And I can't tell you how many people I talk to everyday that say, "Oh, I was a thumb sucker too!" followed by "Yeah, until I was 10 or so." I cringe a little thinking of the dental issues but as a mother I am so enamored by it. She started it at about 3 months and it is her last link to baby hood. The twirling is a bit of a problem because she gets gnarly knots but, again, I sort of love it. She's my baby!