There is something universal about thumb sucking: almost all babies do so, and almost all parents worry about it. While most of these fears are unfounded, you should care if your child sucking their mother's past the age of 4 – the end of the thumb sucking can skew bite development.
Children suck their thumbs because of the way they ingest. Infants move their tongue forward into the space between the two jaws, which allow them to form a seal around the nipple because they are breast or bottle feed. You can visit https://www.amazon.co.uk/Age-2-7-Stop-Thumb-Sucking/dp/B00VQU2DZS if ypu are looking for the devices which can help your child get rid of the thumb sucking habit.
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Around the age of 4, this "infantile swallowing pattern" changes to the adult pattern in which the tip of the tongue contacts the front roof of the mouth just behind the front teeth. At the same time bite their future began to take shape.
In a normal bite of the front teeth slightly overlapping the bottom and does not leave a gap between the jaws when closed. Â But if sucking his thumb continued well into school age, the constant pushing your tongue through the opening in the jaw can change the position of the front teeth as they erupt. As a result, they may not fully erupt or explode too far ahead.
Of course, the best way to avoid this outcome is to encourage your child to stop sucking his thumb before they turn four. However, if they had developed a poor bite (malocclusion), all is not lost – it can be treated.