my son always love.to bite his finger . and worst part is the whole 10 fingers all he can bite. how can I stop him. any good advise

My son who is 2.5 years old now likes to put fingers into his mouth too!! I showed him this video a few times and he stopped doing it. When he does it, I will remind him about the worms. The video is about a girl who is 6 years old likes to bite her fingers and the worm eggs entered into her intenstines through fingers and caused her to feel itchy at night. https://m.facebook.com/story.php?story_fbid=457370681134857&id=440415046163754

Agree with Diana. Cautionary tales are the best way to stop kids from doing anything they shouldn't. It's a bit extreme but these cautionary stories are based in truth, except really extreme and graphic. My grandma used to tell me and my brothers that putting my fingers in my mouth or suckling on them will deter our fingers from growing naturally.