- 90% of infants diagnosed with autism spectrum disorder (ASD) exhibited head lag as infants
- 54% of children meeting criteria for social/communication delay had exhibited head lag as infants
- 35% of children not meeting the criteria for social or communication delay or ASD exhibited head lag at 6 months.
Finally, there was a separate longitudinal study indicating that motor delay becomes more evident as children with ASD near their third birthday. Not all children with ASD experienced motor delay. Although the children with ASD that did have motor delays were more severely impaired by three years of age.
Here are two YouTube videos with examples of typical head/neck movement and head lag at 6 months of age.
Reference: New Study Shows Simple Task at Six Months of Age May Predict Risk of Autism. Retreived from the web at http://www.kennedykrieger.org/overview/news/new-study-shows-simple-task-six-months-age-may-predict-risk-autism on 5/17/12.