The Pull-to-Sit Task: Examining Infant Postural Development in Autism Spectrum Disorder.

Researchers studied how babies develop head and body control during their first 6 months by doing a simple 'pull-to-sit' test monthly. They found that babies later diagnosed with autism were more likely to have difficulty holding their head up by 4 months old. Early head and body control skills were linked to how well children developed social and speech skills by age 2. This suggests early motor development might help identify babies who may need extra support.

This prospective longitudinal study followed 100 infants at varying autism risk from 1-6 months, examining postural development through monthly pull-to-sit tasks. At 24 months, masked examiners conducted developmental assessments. While overall pull-to-sit trajectories didn't differ between groups, infants later diagnosed with ASD were more likely to exhibit head lag by 4 months. Importantly, early pull-to-sit performance predicted social and speech skills at 2 years across all participants.

The findings suggest atypical postural development, particularly persistent head lag, may serve as early indicators of social and language vulnerabilities in autism spectrum disorder.

Early assessment of postural control, particularly head lag persistence beyond 4 months, may inform early identification strategies. Integration of motor assessments into routine developmental screening could enhance prediction of later social and language outcomes, potentially enabling earlier intervention referrals.

The study does not report the actual sample size breakdown by diagnostic groups, which limits interpretation. The predictive value and sensitivity/specificity of head lag as an early marker are not quantified. Long-term follow-up beyond 24 months would strengthen developmental outcome predictions.

To evaluate the predictive relationship between early trajectories of postural and head control during a pull-to-sit task and later autism diagnostic and developmental outcomes. Using a prospective longitudinal design, postural skills of 100 infants at elevated and low familial likelihood of autism spectrum disorder (ASD) were evaluated using a pull-to-sit task monthly from age 1 month to 6 months. At age 24 months, infants were seen for a developmental and diagnostic evaluation completed by examiners masked to participant group. Latent growth curve models were used to compare early trajectories of pull-to-sit performance in infants later diagnosed with ASD and typically developing infants and to predict developmental outcomes.

Pull-to-sit trajectories did not differ in infants with an elevated likelihood of ASD or infants with ASD compared with low-likelihood and typically developing infants, but infants with ASD were more likely to exhibit a head lag by age 4 months. In addition, pull-to-sit trajectories were predictive of social and speech skills 2 years later. These findings highlight the link between very early pull-to-sit skills and later social and language outcomes. Atypical postural development and persistent presence of head lag may be important early indicators of social and language vulnerabilities, including ASD.