Shivani, it does take time. It's important to be patient with her and give her time. Try to distract her whenever you can and occupy the thumb.

<span style="color:#3B5998;"><b><a href="http://app.babychakra.com/article/991">How to save that cute little thumb from being sucked away to glory?!</a></b></span>

Hey Shivani , try to engage the baby and also keep removing the thumb whenever you see him doing...will take some time ..<br> Sharing an article hope it helps .

<font color ="#3b5998"><b> @616d062ac1b4770013bc727e </b></font>