Hi.. stimming is a normal behaviour in young children below 5 years.if it is associated with other symptoms you need to worry. Consult online for discussion regarding the same

Hi, Your child’s behaviour - speech delay, difficulty forming sentences, restlessness in social settings, and stimming - is not a “bad habit.” These are common in children with mild ADHD, sensory sensitivity, or early autism-spectrum traits, especially when they feel overwhelmed or excited. Stimming is the child’s way of self-regulating. We don’t want to punish or shame it - instead, we help the child learn better coping tools.

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Get your child evaluated by a psychiatrist to rule out underlying autism.

I would initially recommend speech therapy from ENT department alongside psychiatry review. Speech therapy will boost up the child’s confidence, primarily. And the rest can be substantially managed via drug therapy.