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Categories of infant siblings of children with ASDs (AU sibs) based on 6-month motor delay (MD) and 18-month communication delay (CD). These include infants with MD and CD, only MD, only CD, and no MD or CD.
| 6-month motor vs. 18-month communication performance (n=21) | Communication delay present |
No communication delay |
| Motor delay present | 8 AU sibs had both, MD and CD | 3 AU sibs had MD but not CD |
| No motor delay | 4 AU sibs had a CD but no MD | 6 AU sibs had no MD or CD |
