FMR1 and Down syndrome: Trio‐WES could identify all the ‘traditional approach’ diagnoses except for two cases (i.e. the 1.6% of patients): in particular, a male patient presented a pathological expansion of FMR1 gene promoter (OMIM #300624) and the second one was diagnosed with a maternal MidXq28‐duplication syndrome (OMIM #300815).