The goal of this study was to describe sensory processing in children with an FMR1 premutation and to examine differences in sensory challenges when compared with children with the full mutation and those with no fragile X. Our findings add to the mounting evidence base that suggests that some individuals with an FMR1 premutation have a similar, though less severe, clinical phenotype as those with FXS. This evidence concerns the gene FMR1 and fragile X syndrome.