My ds has just turned 4 and was diagnosed with ASD last year. His behaviour is extremely challenging. Everyday he hits and grabs his sisters hair and won't let go for a minute. For example this happened in garden today so I made him come inside he then kept hitting me. He does not understand other peoples feelings or that he hurts us. It is also very difficult when out walking as he either won't walk (so I have to carry him) or he just wants to run but has no awareness of danger and will just run across the road. Would like some advice as to whether this will always be the case or will things improve as he gets older?