There is good help available, I think, on the child development forum.
I think that the response to you should include a professional knowledge of child development and abuse symptoms. I am not aexperienced with child development. Have you taken your son to the pediatrician? You could also see a child therapist.
In regard to abuse, I would see if another practice could see him sooner than 6-8 weeks.
As LCF says, his behavior is a sign of something, and there is evidence that supports abuse should be investigated.
Be cautious of any answer that you get on a forum with no professional to monitor the forum. However, some parents on various forums can be very insightful, for example.
Wow, for a second there I thought you were in the wrong forum. You might try asking this in the Abuse forum ~ where you'll get an equal array of diverse opinions.
Acting out in this way is a sign of something ~ Best Regards