2 doctors weighed in:
How do you stop a 4 year old child from sucking her thumb?
2 doctors weighed in

Dr. Patrick Hieber
Pediatrics
1 doctor agrees
In brief: Thumb sucking
There is nothing that "works" other than very punitive measures which are not recommended.
One can try "+" reinforcement with small rewards when the child is observed to be not thumbsucking. I would consult your dentist and ask their advice about the need for an appliance fit in the upper palatal area if significant orthodontic effects are bieng caused by the behavior.

In brief: Thumb sucking
There is nothing that "works" other than very punitive measures which are not recommended.
One can try "+" reinforcement with small rewards when the child is observed to be not thumbsucking. I would consult your dentist and ask their advice about the need for an appliance fit in the upper palatal area if significant orthodontic effects are bieng caused by the behavior.
Dr. Patrick Hieber
Dr. Patrick Hieber
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