The condition can manifest in many ways, but the effects that most strongly impact quality of life are seizures, developmental delay, intellectual disability, and autism.
[uabmedicine.org]
A combination of symptoms may include seizures, intellectual disability, developmental delay, behavioral problems, skin abnormalities, and lung and kidney disease.
[dbpedia.org]
Mental Disability and Developmental Delay The following are all used to help those who have mental and developmental problems: special educational programs behavioral therapy
[healthline.com]