If there are certain issues that you have identified , it is better to get a proper evaluation done. A proper diagnosis will help in formulating a tailored management plan for the child. L carnosine syrup is a fair option but more than that the child will need therapy to help with these issues. Besides, its best to initiate any medication under appropriate supervision.
Next Steps
Seek a psychiatrist or a psychologist opinion. Proper assessments will provide more elaborate answers.