The major reason is the failure to develop at one level is thought to inhibit later stages of development.
What is developmental disorder?
A developmental disorder refers to mental illness that occurs in children or adolescents which hinders their normal development.
The above disorder can also be traced in adults, but the chance of successful treatment usually decrease with age.
Hence, the major reason is the failure to develop at one level is thought to inhibit later stages of development.
Learn more about developmental disorders here: https://brainly.com/question/17191411
