angelman syndrome , is a genetic disorder that causes developmental delay . the most serious symtoms are mental retardation , lack of speech , short attention span . they also have behaviors like hand flapping , hypermotoric behavior and a easy excitable personality . some people with this disorder have symtoms of drooling , a suck / swallowing disorder , frequent tongue thusting . if you have angelman you might have different looks from your family members . the most common things to have is wide spaced teeth , hypopigmentation ( which is ligher hair and skin then your family members ) .