Usually sucking fingers of bad habits that followed most of the children, as they disturb not only because they are strange and offbeat view, but because it will affect later on the appearance of the baby's mouth where the thumb to push the front teeth to the outside and to the top of causing visibility to the front and make gaps in Mother them.
So Mother doctors advised of the need Child Alert for kindness when you see heads his thumb toward his mouth, and be sure to use a tone of quiet voice, do not insist or decrease would, as the thumb-sucking at this age bring comfort and calm the child, if I screamed in these moments feel more of tension, and it wants to suck his thumb more and more.
Encourage your child to be his hands busy with writing or drawing or playing.
It can also put a rewards system as an incentive for him, Children at this age respond if you paste them color images on a white plate, call them Panel overcome the thumb-sucking, and every day that passes without sucking his thumb stuck his image that of his own choosing, has prepared also to reward At the end of the period, such as buying a great gift for him.