9 year old behavior

[amberh]

Hi, I have 3 boys ages 9, 7, and 5.  My 9 year old has been exhibiting behavior that I am truly not sure how to handle.  He is in the fourth grade, the youngest in his class.  He has very good grades, is very smart, and has a high reading level. Socially he's not as mature as the other kids his age.  This has been brought to our attention starting in the first grade.  He likes to make noises with his mouth anything that has a sound is fine, at anytime. When asked to stop he will do it a few more times.  My younger boys don't act like this they even seem more mature than their older brother.  When he asks for things, when told no he will repeatedly ask for hours on end.  When told to go to bed at night, he finds reasons to keep coming back out.  
He doesn't like to read unless told to, he claims he's bored unless he's constantly at some activity. The things that hold his attention best are movies and video games.  When he conversates it is only about these activities.  His writing in school also reflects this as well as his maturity level.  
When other children come to our house he doesn't interact well with them.  He seems bored quickly with them and becomes emotionally stressed.  He will argue with us and put up a huge fuss, again all things my younger boys don't do.  
My son also has bedwetting problems, as well as during the day at times.  He has been checked out by a urologist who has found no medical cause for this.  Again the younger boys have never wet the bed or had daytime wetting problems since potty training.
We have had him observed by the social worker at school who felt for sure this is not an ADHD or ADD issue. She also encouraged us to place him into fourth grade from third where we wanted to hold him back hoping we would catch up socially and maturity wise. He is not coping well with the load of school responsibility.
Please help... Suggestions greatly appreciated.

[margypops]

Perhaps he is trying to get more positive attention from you, does he get the same quality time and attention, as the other ,boys? he doesnt feel left out in the Family, sometimes if children dont get the attention they need or seek it shows up in acting out and doing negative things to get that attention. Focus on his positive side and praise him when you see him doing something right.As the social worker has said he has nothing like ADD then realise that he isnt happy with something and try to fix it for him, Does his Dad do sports with him and give him quality tiime on outside activities.