Thumb Sucking, Teeth and Speech

It sounds like in addition to sucking her thumb that she thrusts her tongue. I have personal experience with overbites, and have never seen speech issues due only to the buck teeth, which leads me to think she is thrusting.

Tongue thrusting is something a logopedic specialist can help her with. They will teach her how to use her tongue differently, which will also help reduce her overbite when her adult teeth come in.

On a side note, the lisp will give her a wonderful Madrid accent, considered very classy in some circles.

I have twin 4 year olds. One sucks her thumb and one lisps, but they're not the same kid! When I asked the doctor about the speech issue, she said they don't intervene with speech therapy until elementay school age, and not to worry about it.

Although my daughter doesn't and has never sucked her thumb, she also has a significant overbite. Her pediatric dentist has fitted her for an appliance that she will keep in her mouth 24/7 (and then possibly only at night) for 6 months. It's actually meant for thumb suckers. There is a little ball on a wire that is positioned at the roof of the mouth for children to twirl with their tongue. This is supposed to help correct the overbite. She's going Monday to have it put in. Maybe you want to consider it too. Take her to a pediatric dentist. Mine told me she was concerned about the development of her lower jaw/mouth. Our girls have different issues, but maybe she could be helped by this.

We had the same issue, and I assume it is due to thumb sucking as well, although my little one doesn't have an overbite, just the lisp. The school speech therapist evaluated our little one and said they won't intervene just yet because it is developmental, very common at this age, and that most times they won't start therapy until after age 6. It wouldn't hurt just to have her evaluated, but they may tell you to wait on therapy. Good luck!