Here's How to Get Kids to Stop Sucking Their Thumb
When a child is allowed to indulge in thumb sucking too much it can lead to changes in their mouth, jaw, and teeth. Breaking this habit is recommended, but parents can rest assured that the habit is common and a normal thing for a child to do. Some 90% of newborns start doing it as early as two hours after birth.
Thumb Sucking Can Be Problematic
While the thumb-sucking reflex may seem adorable, it can become a habit that has negative consequences. It can affect facial bones and teeth as the child and their mouth, palate, and jaw grow. Pediatricians say that thumb sucking should ideally stop between ages two and four. However, breaking such a habit can prove challenging for many parents.

Experts emphasize the risks associated with thumb sucking as it can cause long-lasting damage. The habit starts as a normal part of a newborn's development and even serves to give proper tone to the tongue and jaw position. However, it may become a source of comfort for older children, which is why it often persists beyond infancy.