Should I stop him from sucking thumb?

My son is 3 months old and has recently figured out how to suck his thumb. He takes his binky sometimes but he really only wants his thumb lately. Should I stop him? I don’t know how but I’ve heard that it’ll be bad later on. My daughter had a binky and it was hell taking away from her when she was around 1. You can’t take their thumb away, lol.

So what should I do? He looks so cute doing it though!