START-Play Physical Therapy Intervention Impacts Motor and Cognitive Outcomes in Infants With Neuromotor Disorders: A Multisite Randomized Clinical Trial.

When infants show early signs of motor delay, physical therapists and families often wonder whether adding a specialized play-based intervention to usual early intervention care makes a meaningful difference, and for which infants. This multisite randomized trial compared usual care early intervention alone with usual care plus START-Play, a twice-weekly, 12-week home program combining caregiver-guided sitting support with reaching and play, delivered to 112 infants aged 7 to 16 months. The results differed by severity: infants with significant motor delay who received START-Play showed better short-term cognitive, fine motor, and problem-solving scores at 3 months, with some fine motor and reaching gains still apparent at 12 months. Infants with milder delay showed little added benefit beyond usual care, except for one isolated finding in receptive communication.

Because the clearest benefits were seen in a subgroup and rested on specific outcome measures rather than a uniform pattern across the whole study, the findings describe a promising but subgroup-specific signal rather than an established benefit for all infants with motor delay.

If your baby has been identified as having a delay in motor development, you may be offered different types of early intervention therapy, and it can be hard to know what added value a specialized program brings. This study looked at a play-based physical therapy approach called START-Play, used alongside usual early intervention, in babies aged 7 to 16 months with motor delays. The researchers found that for infants with more significant motor delays, adding START-Play was linked to better short-term scores in thinking skills, hand use, and problem-solving compared with usual care alone, and some of these gains in hand use and reaching were still seen a year later.

For infants with milder delays, there wasn't a broad pattern of extra benefit, aside from one result in language understanding that could be a chance finding. This was one trial, and the clearest benefits applied to a specific subgroup of infants, so these findings don't tell us how START-Play would work for every child with motor delay.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This trial informs the question of whether adding a structured, caregiver-mediated play intervention (START-Play) to usual early intervention improves motor and cognitive outcomes in infants with neuromotor disorders, and whether severity of delay matters. Among 112 infants (55 usual care, 57 START-Play) across 5 sites, infants with significant motor delay who received START-Play showed better outcomes at 3 months on Bayley cognition, Bayley fine motor, and problem-solving (APSP), with fine motor and reaching frequency differences persisting at 12 months; infants with mild delay showed a positive effect only for Bayley receptive communication, an isolated result among several comparisons. This sharpens expectations that embodied-cognition-based play interventions may have more measurable short-term benefit in infants with more significant motor delay rather than across the full spectrum of motor delay severity.

The main limitation is that the clearest effects emerged in a subgroup analysis from a single multisite trial, and the abstract does not report a uniform benefit across all outcomes or both severity groups, so the isolated mild-delay finding and some long-term effects should be interpreted cautiously rather than as an established treatment advantage.