The memory of a baby sleeping with his finger in his mouth can be one of the kindest things you will ever see. But as this child grows up and continues this habit, it can get a little annoying.
Some pediatricians have observed this behavior in young children and have concluded that thumb sucking is common in children who, at a very young age, have long been physically separated from their mother, perhaps for work-related reasons. It is also said that thumb sucking helps calm and comfort young children. There are many more reasons given at https://stopthumbsucking.org of thumb sucking.
Find ways to calm your child apart from sucking your thumb. This can be done with a favorite animal or plush toy.
Add the bitter liquid to the child's thumb. After you talk to your child and explain that thumb sucking is not a good habit, tell them to set a goal of learning how to quit. The bitter liquid in the thumb of the child is the residue of what they have to achieve. However, many experts considered this to be a cruel technique.
Wait for the child to find motivation and use it to break the habit. For example, as they start preschool and become more involved with other young children, let them realize that they are too old to suck their thumbs and use examples of other preschoolers that you like. don't suck their thumbs.
Participate in other activities that require the child to use all their hands. This will help distract the child from the habit. The longer and funnier the activity, the less they worry about thumb sucking.
Be patient with the child. It is terrible to try to forcibly break the habit of breastfeeding a child before they seem ready to quit on their own.