Hi yes and it's harmless, do not fret. Just try to distract but not forcefully.

<span style="color:#3B5998;"><b><a href="http://app.babychakra.com/article/6059">12 Tips To Stop Your Child From Sucking Thumb</a></b></span>

<span style="color:#3B5998;"><b> @616fd972ade2a9001326872e </b></span> Thanks

Yes absolutely. It's very common, infact it starts in the womb itself. There we can't stop them right? Gently take out the fingers from the mouth, politely say no. Don't show anger or force. Baby will learn. And baby soon outgrows this habit, till then keep calm n keep things around him clean&#128522;