how to stop the habit of finger sucking mittens all the time is correct?

A. don't use mittens teething, exploring, hunger, self soothing , sleep , tiredness are common reasons. babies at this age put everything in mouth. get  a teether of good company, BPA free for baby. also get some plastic toys with smooth edges , check for good quality . also you can give some clean washed ccolorful cloths to baby to play with. they love different textures.