As Harry has a genetic disorder due to an abnormality in his x chromosome which has become constricted, he most likely suffers from fragile X syndrome.
In the field of medicine, fragile X syndrome can be described as a syndrome that occurs due to a constriction in the X chromosome leading to various disorders such as redundancy in the intellect of a person.
A person suffering from Fragile X syndrome might also have various developmental disabilities, a slower process of learning new things, a short attention span, and many social problems.
As Harry's doctor has revealed about his chromosome X being constricted and also he has lower intellectual abilities, hence we can say that Harry most likely suffers from fragile X syndrome.
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