This is what I did... And I make my sil follow the same for her son... None of my daughters n nephew have ever sucked their hand... Blessed I would say... I have seen an older nephew and niece who are 7 years sleep with their thumbs in their mouth... This made me sure that I wud the let my little ones do it, no matter how beneficial it is for the baby...

http://mylittlemuffin.com/do-you-want-your-baby-to-stop-sucking-thumb-here-is-what-worked-for-me/

thank u all for guiding me.

putting fingers in mouth is a milestone and nothing to.worry about. pls do not cover his hands or fingers and let him do what he is doing.and this is no way connected to hunger. this phase passes soon

hey not to worry, it's normal, he may require some soft teether now. and as per my baby's pediatric neurologist licking fingers is a kind of fun for infants.