I have done the older kids age group
I take a bunch of pictures of kids with Ds. And I did ask the parents before for pictures, so I have used those pictures I have permission to use multiple times.
Anyway, I have several pictures out, for the school setting I go to it works best to have the pictures on the tables. There are about 5 large tables.
As the kids come in they start looking at pictures, and it is very interesting to even hear the comments as they come in (they KNOW I am coming and that I will talk about Down syndrome and that my baby has it, so there has only been one inapropriate comment said and I addressed it immediately)
Then I ask, "Tell me how do these kids look alike?" So I write it on the board, and then I talk briefly about the certain typical characteristics. After that, I tell them how Down syndrome happens and some of the other things they did not say.
I bring up muscle tone and ask them what muscles we have in our bodies. Pretty amazing to see them say things like "you use your muscles to walk, I bet that is why it takes them longer!" yeah!
After that, I ask them to look at the pictures and tell me how they look different
This is my favorite part! Because they do begin to see the differences and I love to really stress those out.
At the end, I always allow time for questions, and they always ask!
And to close, I talk about the R word and why it is not okay.
Hope this helps!