Symptoms
Children who have Jacobsen's Syndrome may have some of a number of symptoms, including heart problems, speech and language problems, specific facial characteristics and mild to severe mental retardation.  They often have ptosis (droopy eyes) and a broad bridge between the eyes, can have problems with kidneys, heart, (ear-)infections and blood platelets.  The mental level differs: there are children with mild to severe mental handicaps. This depends probably of length and place of the missing piece of the chromosome.