It is normal for babies to check the function of their mouths by placing objects such as their thumbs inside them. You don't have to worry if your baby sucks their thumb a lot. 

For babies who are still developing their baby teeth, thumb sucking can stimulate the growth and development of their baby's teeth. You can also know more about how to prevent thumb sucking in children through various online sources.

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Thumb sucking is not a problem with babies as they usually do it to calm and comfort themselves. Problems can arise in children who continue this habit if their milk teeth fall out around the age of six.

If you have a young kid whose real teeth are starting to grow, thumb sucking can be a problem. Most children stop sucking their thumb between the ages of two and three. 

According to some surveys, if thumb sucking remains as adult teeth come in, this can cause problems related to misalignment of the teeth and growth of the jaw, gums, and mouth.

It can also interfere with your child's speech afterward, causing whispers or other language difficulties. As a parent, you may need to initiate adjustments and interventions if thumb sucking is a bigger problem for your child.

This is how you can stop thumb sucking

1)Give comfort to your child if thumb sucking occurs when he or she is afraid.

2)Limit thumb sucking at bedtime.

3)Use positive reinforcement for good behavior.

4)Talk to your child about potential problems this habit might cause.

5)Distract your son or daughter with an activity such as a fun game every time when you see them sucking their thumb.