The Rubinstein‐Taybi syndrome is a multiple congenital anomaly syndrome that is mainly characterized by a peculiar face, broad thumbs, broad big toes, short stature, and mental retardation. The facial appearance is striking, in part due to the dysmorphic features, but also due to their facial expression. The syndrome shows a pleiotrophy of features, of which the behavior, orthopedic problems, keloid formation, and increased tumor risk are especially important. The syndrome is caused by
de novo
heterozygous constitutional deletions or mutations of the CREB‐binding protein (
CBP
) gene.