Growth retardation, craniofacial anomalies, microbrachycephaly and reduced body fat have been described in cohesinopathies such as Cornelia de Lange syndrome CdLS, which is inherited in an autosomal dominant (NIPBL, SMC2 or RAD21) or X‐linked (SMC1A or HDAC8) pattern.38 Here, RAD21 is linked to Cornelia de Lange syndrome.