>> reporter: and september stress is more intense than ever for kids and parents. the lane family of garfield, new jersey, gets group butterflies. >> i am very worried. >> making new friends. >> my locker combination because i sometimes have problems with that. >> if i'm going to have really good grades. is it going to be hard or easy? >> we're pretty anxious right now. >> reporter: in a study by cafemom, a website devoted to parenting issues, 41% of kids now say they have some form of anxiety about going back to school. and high anxiety? 28% of girls feel highly stressed. 12% of boys. >> girls tend to be a little more stressed as a group and tended to be driven more by social concerns. >> reporter: what are the kids most worried about? up through the tweens, where mean girl and bully syndromes are often in full bloom, it's the challenges of social life. >> i might be nervous about making new friends.