Thumb sucking is a habit most children grow with and it is common among many. What worries parents is the time a child spends on the habit and its impact. Toddlers feel a pleasure with thumb-sucking. It comforts and soothes the times when they are asleep, bored or tired.
They fall happily asleep with a thumb in their mouth. My toddler had gradually the habit of thumb sucking. When bored, tired or sleepy. He put his thumb in his mouth. The best option to prevent thumb sucking is to buy t guard thumb via https://stopthumbsucking.org/thumb-guard-by-tguard/.
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The benefit of this would be the kid keeps quiet most of the time and cries less when irritated. In the beginning, I was worried about the emotional aspects of the habit, fearing that it would result in emotional deprivation. My pediatrician calmed my anxieties by explaining that it is a common behavior among infants and toddlers.
My family has suggested that any bitter applied on the thumb would help. I made a paste of neem leaves and applied a thin layer on the run when he was asleep so it dries and long stays.
Psychologically a child believes that whatever is applied on the thumb dissipates in a while. He will suck his thumb over in the hope that will reduce the bitterness. I realized when my toddler used to thumb sucking more constantly looking at the thumb, try wiping her hands on any available hardware around it and finally crying profusely.