Can someone tell me how they did this??

A friend send me this yesterday and I am having a hard time to come up with the solution to this:



http://ift.tt/1CRGHMb



I do not believe the child has telepathy or something like that because I do not believe that autistic children are paranormal. The only things as a explanation I could come up with was that the child has memorized the numbers, the video is a fake or the child could see somehow how the mother was drawing the numbers itself and memorized them.



I am open to any other explanations.



Thanks for reading this and your time. The video is short it has 2 minutes.