The Journal of Developmental and Behavioral Pediatrics reports that 12 children with Down syndrome and autism exhibited language loss at a mean age of 61.8 (SD=22.9) months old.  Children with only autism exhibit language loss at a mean age of 19.7 (SD=5.8) months old.  For other skill loss, children with Down syndrome and autism had a mean age of 46.2 (SD=19.1) months and children with autism had a mean age of 19.5 (SD= 5.6) months.

Reference:  Castillo, Heidi MD ; Patterson, Bonnie MD ; Hickey, Francis MD; Kinsman, Anne PhD; Howard, Jennifer M. BS; Mitchell, Terry; Molloy, Cynthia A. MD.  (2008) Difference in Age at Regression in Children with Autism with and without Down Syndrome. 

Journal of Developmental & Behavioral Pediatrics. 29(2):89-93. 

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