LOLWUT
I google searched for "Downes syndrome simulator", as I was going to have a go at that myself. There wasn't one, but on the first page of results I found this.
http://www.3bscientific.co.uk/patient-care-manikins/solomon-downs-syndrome-doll-trisomy-21-african-male,p_1181_51_3421.html
An african american downes syndrome doll. I bet they're hot sellers.