Thumb sucking is a calming and reflexive way, a natural reflex for babies and toddlers, and most children will quit on their own. It starts in the womb before birth.
Babies and infants often continue these relaxation exercises after birth, which often helps them calm down during sleep. You can also know more about how to quit thumb sucking through various online sources.
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The effect of thumb sucking on your child's mouth and teeth
Parents often worry about the effects of thumb sucking on their children. If your baby continues sucking after they have teeth, this can lead to "crooked" teeth and bite problems that affect milk and permanent teeth.
Thumb sucking can cause problems with proper mouth growth and alignment of the teeth, resulting in the upper front teeth tilting outward and the maxilla narrowing at the back.
Encourage ways to reach out to your child to help stop thumb sucking
1) Use positive reinforcement: Praise your child or give them a small gift such as an additional bedtime story, a trip to the park when your child managed to avoid thumb-sucking.
2)Focus on complimenting your child when he or she is not sucking their thumb.
3)Children often suck their thumbs when they feel unsafe or need comfort. Focus on eliminating the root causes of anxiety and keeping your child comfortable.