Hey Vedasubbu, Even i have this habbit of nail biting and by seeing me my kid also started doing this. I tried educating him and he finally given up the habbit. Now, whenever i try biting my nails infront of him, he will warn me that he will also start biting his nails if i do so again.. Ha ha ha..Do not scold him. Just educate him and he will also give up this habbit. Make sure no one has this habbit in your family as seeing them again your kid may start doing the same someday.