My 20 months old baby has a habit of sucking his thumb. People say it's not a good habit. What can I do? Please help

TO be honest, you really can't do anything about it. It will go on its own. Try to deviate him when he is sucking his thumb. Also keep taking out his thumb from his mouth

Babies do that as they explore themselves and hands come first.. give clean teether to hold so instead of thumb baby with chew teether...