My year 2 ds has always had amazing concentration and been very interested in things for periods of time (eg. lego, club penguin, etc.). I am finding now the older he gets the more completely obsessed he gets about things to the point of it being pretty much all he thinks about and wants to do. I was wondering if this is normal boy behaviour, as none of his friends seems to be so extreme about things they like. Also, how can i help him to stop being so fixated on one thing so he will happily do other stuff without a sulk?