Which is of a lesser evil? thumb sucking or sucking on pacificer? my son (3mths old) has a tendency to suck his thumbs.. so whenever he does so, I will let him suck on the pacificer instead..

My LO used to take pacifier but one fine day, she decided to suck her thumb instead. I've been trying to switch her back to pacifier but couldn't so I decided to just let it be since she only suck when going to sleep or hungry.. I supposed it's a form of comfort for them..