WHY kids suck their thumb?
Thumb sucking can even start in the womb, making it almost an instinctual mechanism.So when the infant is placed at its mother breast for the first time, touching the breast can stimulate the sucking reflex, which helps them in getting nutrition for survival.
In the absence of feeding, the infant learns to substitute it will alternatives like sucking fingers, toe, pacifiers or bottles. Also, babies are exploring the world. They often put a lot of things in their mouth, including their fingers.They are learning about objects, the environment, people around them and themselves. They use their mouth to feel things as their fingertips aren't as touch-sensitive yet. So they often put objects or their fingers in their mouth to learn.
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