Assessment of child motor development through parent-completed surveys in families with children with Autism Spectrum Disorder. An observational, cross-sectional study
This observational, cross-sectional study of 156 children with Autism Spectrum Disorder reveals significant motor development delays, particularly in head control and crawling, while confirming that parental perceptions of milestone acquisition align with actual developmental timelines and that early walking is strongly associated with the timely achievement of prior motor milestones.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Long before a child speaks their first word or recognizes a familiar face, their body is already telling a story. For decades, scientists have known that Autism Spectrum Disorder, a condition affecting how people communicate and interact with the world, often reveals itself through subtle differences in movement. While the official diagnosis usually comes later, often after a child has turned three, the earliest warning signs frequently appear in the way a baby holds their head, rolls over, or learns to walk. These motor skills are not just physical feats; they are the foundation upon which a child builds their independence. When these early movements are delayed or happen in an unusual order, it can signal that the brain is developing differently. Understanding exactly how and when these milestones occur in children with autism is crucial, not only for identifying the condition sooner but also for understanding the unique path each child takes as they grow.
A team of researchers in Spain set out to listen to that story by asking the people who know these children best: their parents. They gathered information from 156 families who have children between the ages of zero and six with a confirmed diagnosis of autism. The researchers did not observe the children in a clinic; instead, they relied on the detailed memories of caregivers who filled out a survey about their child's early life. The survey asked specific questions about when the child first held their head steady, rolled from their back to their stomach, sat up without help, crawled on hands and knees, and finally took their first independent steps. By piecing together these memories, the researchers could reconstruct the timeline of motor development for this group and compare it against what is typically expected.
The results painted a clear picture of a developmental path that often moves more slowly than the standard timeline. When looking at the very first skill, holding the head up, only half of the children in the study achieved this before their third month, a milestone that typically happens much earlier for most babies. The delay became even more apparent as the children grew. While the majority of children in the study eventually learned to sit and crawl, a significant number of them did not follow the classic pattern of crawling on their hands and knees. In fact, nearly one in five children in this group did not crawl in the traditional way at all, opting instead to scoot on their bottoms, roll, or use other methods to move across the floor. This rate of skipping the traditional crawl was far higher than what is seen in children who are developing without autism.
Perhaps the most telling finding concerned the moment a child begins to walk alone. In this group, the vast majority did not start walking until after their first birthday, with many waiting well past that mark. The study revealed a strong link between the skills learned before walking and the timing of that first step. Children who had mastered the earlier skills, like sitting and crawling, at the expected times were much more likely to walk early. However, no child in the study who had missed one or more of those earlier milestones managed to walk before twelve months. It was as if the body needed to complete the previous steps in the sequence before it could move forward to the next one. For every additional milestone a child achieved on schedule, their chances of walking early increased significantly.
The parents' own views of their children's progress matched the data they provided. When a child had achieved more milestones at the expected times, the parents felt more confident about their motor development. This suggests that families are often aware of the pace of their child's physical growth, even if they do not have the medical terms to describe it. The study confirms that motor delays are a common and early feature of autism, appearing in the way children control their heads, move across the floor, and eventually stand on their own. While the researchers noted that relying on memory can sometimes be imperfect, the consistency of the patterns they found offers a valuable window into the early lives of these children. It highlights that the journey to walking is not just about legs and feet, but about the entire sequence of movement that comes before it, and that paying attention to this sequence could help families and doctors understand a child's needs sooner.
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