The behaviour or changes needs to occur frequently, have on hand the milestones checklist, and previous obective observations, if assesments at school were made, add them to the portfolio. Start with asking parents if they observed any changes or if they are aware onf the milestones checklist or app by the CDC center of control of disesease and prevention. Go through the skills that are ok, starting with positive results is preferable and then approach the red flags, explain parents what cognitive area is being affected and where and when you can observe this disadvantages out of norm based on standard assesments like WISC-V or CDC checklist. once parents, director and teachers talk, is important to have on hand referral specialists to adress the red flags