my ds has always been placid and gentle but he has started pinching and biting the last few weeks. i have made the mistake of making a big deal out of it when it first happened and he now thinks it is hilarious when i tell him no. my face is always stern when i tell him no but he just laughs and thinks it a game any advice on how to stop this bad habit he has picked up. he is invited to a 2 years olds birthday party tomorrow but i am too embarrassed to take him in case he starts hurting the other children.