Autism and Down syndrome combined is not typical Down syndrome neither Autism along. Having these conditions combined brings more challenges and deficits in all developmental areas in Kids Down syndrome and Autism than just having Down syndrome along. There are more behavioral and social challenges than what is observed Down syndrome along. There is even lest room for hope for a kids with this coexisting conditions. Here is an article of a dad who talks about his experience raising a child with Autism and Down syndrome:
But regardless the odds, I keep fighting for a better future for my son.