Parent-infant interaction trajectories in infants with an elevated likelihood for autism in relation to 3-year clinical outcome.
Babies later diagnosed with autism already show dull, declining parent-infant play by 8 months—screen interaction quality early and coach parents right away.
01Research in Context
What this study did
The team watched babies who had an older sibling with autism. These babies have a higher chance of autism themselves.
They filmed each baby playing with a parent at 8 months and again at 14 months. Trained coders rated how well the pair stayed in sync.
When the children turned 3, clinicians gave them a full autism evaluation. The study asked: do early interaction scores predict who gets the diagnosis?
What they found
Most babies who later received an autism diagnosis already showed lower-quality interactions at 8 months.
Their eye contact, smiling, and shared attention dropped even more by 14 months. This steady slide let researchers forecast the 3-year outcome.
How this fits with other research
Clifford et al. (2009) used home videos and also saw that early dyadic cues forecast later social skills. The new lab data confirm those older clips and push the warning window back to 8 months.
Byiers et al. (2025) add another layer: when mothers feel depressed, they touch their high-risk babies less. Pair that with the current finding and you see a double risk—less touch and less infant attentiveness.
Sullivan et al. (2007) showed that weak response to joint attention at 14 months flags autism. Eirini et al. now show the whole interaction, not just one skill, is already fading at that same age.
Why it matters
You can spot trouble before the first birthday. If a baby avoids eye contact or the dyad feels flat, note it and start parent coaching early. Track interaction quality at each visit, not just milestone checklists.
Want CEUs on This Topic?
The ABA Clubhouse has 60+ free CEUs — live every Wednesday. Ethics, supervision & clinical topics.
Join Free →Add a 2-minute free-play item to your intake: rate eye contact, shared smiles, and turn-taking—if low, refer for parent-infant coaching.
02At a glance
03Original abstract
Developmental antecedents of autism may affect parent-infant interactions (PII), altering the context in which core social skills develop. While studies have identified differences in PII between infants with and without elevated likelihood (EL) for autism, samples have been small. Here, we examined whether previously reported differences are replicable. From a longitudinal study of 113 EL and 27 typical likelihood infants (TL), 6-min videotaped unstructured PII was blind rated at 8 and 14 months on eight interactional qualities. Autism outcome was assessed at 36 months. Linear mixed-effects models found higher parent sensitive responsiveness, nondirectiveness, and mutuality ratings in TL than EL infants with and without later autism. PII qualities at 8 (infant positive affect, parent directiveness) and 14 months (infant attentiveness to parent, mutuality) predicted 3-year autism. Attentiveness to parent decreased between 8 and 14 months in EL infants with later autism. This larger study supports previous findings of emerging alterations in PII in this group and extends on this by detecting earlier (8-month) predictive effects of PII for autism outcome and a more marked trajectory of decreased social attentiveness. The findings strengthen the evidence base to support the implementation of early preemptive interventions to support PII in infants with early autism signs.
Autism research : official journal of the International Society for Autism Research, 2024 · doi:10.1002/aur.3190