Thumb Sucking
Have you ever wondered why babies put everything in their mouths? The answer is quite simple. Oral exploration represents a critical developmental stage in a baby's life. While parents need to monitor what their baby is doing and protect them from potential harm, it's perfectly normal to watch an infant grab an object and put it in their mouth to get a sense of its texture and taste.
In addition to exploring the world with their mouths, babies also find comfort sucking a thumb, finger, or pacifier. However, as a baby matures and develops increasing self-control and self-awareness, the prevalence of these habits should decrease. In fact, most children will give up these activities between 2 to 4 years of age.