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Through parental questionnaires and children\u2019s health records, we retrospectively compared early motor skills, including the frequency of H&amp;K crawling in 79 children with Autistic Disorder or Asperger Syndrome versus 100 children with typical development (TD). We found H&amp;K crawling to be significantly less frequent among children with ASD (44.2%) versus children with TD (69%). Children with ASD also showed a decreased frequency of acquiring a seating position without help and a later mean walking age compared to the TD children. These data suggest that early motor development delays may be a useful sign for detecting ASD at early ages.<\/jats:p>","DOI":"10.1177\/00315125211037983","type":"journal-article","created":{"date-parts":[[2021,8,10]],"date-time":"2021-08-10T02:26:56Z","timestamp":1628562416000},"page":"2148-2165","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":6,"title":["Early Motor Skills in Children With Autism Spectrum Disorders Are Marked by Less Frequent Hand and Knees Crawling"],"prefix":"10.1177","volume":"128","author":[{"given":"Nathalie","family":"Lavenne-Collot","sequence":"first","affiliation":[{"name":"Service universitaire de psychiatrie infanto-juv\u00e9nile, CHRU de Brest, Brest, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nelle","family":"Jallot","sequence":"additional","affiliation":[{"name":"Service universitaire de psychiatrie infanto-juv\u00e9nile, CHRU de Brest, Brest, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julie","family":"Maguet","sequence":"additional","affiliation":[{"name":"Service universitaire de psychiatrie infanto-juv\u00e9nile, CHRU de Brest, Brest, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C\u00e9line","family":"Degrez","sequence":"additional","affiliation":[{"name":"Service universitaire de psychiatrie infanto-juv\u00e9nile, CHRU de Brest, Brest, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michel","family":"Botbol","sequence":"additional","affiliation":[{"name":"Service universitaire de psychiatrie infanto-juv\u00e9nile, CHRU de Brest, Brest, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9742-7147","authenticated-orcid":false,"given":"Marine","family":"Grandgeorge","sequence":"additional","affiliation":[{"name":"Service universitaire de psychiatrie infanto-juv\u00e9nile, CHRU de Brest, Brest, France"},{"name":"Laboratoire de Neurosciences de Brest, Universit\u00e9 de Bretagne Occidentale, Brest, France"},{"name":"EthoS (\u00c9thologie animale et humaine) \u2013 UMR 6552, Univ Rennes, Normandie Univ, CNRS, Paimpont, France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2021,8,9]]},"reference":[{"key":"bibr1-00315125211037983","doi-asserted-by":"publisher","DOI":"10.1097\/00004583-199305000-00019"},{"key":"bibr2-00315125211037983","volume-title":"Diagnostic and statistical manual of mental disorders","author":"American Psychiatric Association.","year":"1994","edition":"4"},{"key":"bibr3-00315125211037983","doi-asserted-by":"publisher","DOI":"10.1176\/appi.books.9780890425596"},{"key":"bibr4-00315125211037983","volume-title":"Sensory integration and learning disorders","author":"Ayres A. 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