There's probably a million threads on this- sorry if I'm repeating...

I've been getting a lot of comments lately on how much DS sucks his fingers. He's 5 months old and has sucked them since before he was born. Every US showed him with his hand in his mouth! I'm just interested in people's experiences. He would never take a dummy, so it's fingers for him, which I'm fine with, but some people seem to have quite a vocal problem about... is it actually a problem? Not that I can do anything about it anyway... I mean, he's 5 months old