List of diseases that include delayed milestone as a symptom. Any major, well-known medical conditions associated with delayed milestone are included below, listed alphabetically with photos when available. Any maladies, sicknesses or illnesses with delayed milestone as a symptom can be seen below. For any real, further diagnosis of something you feel you might have, please consult a doctor. This list includes information about each disease, such as what risks are associated with it. List is made up of many different illnesses, including Prader–Willi syndrome and Cystic fibrosis.This list answers the questions, "What risks are associated with delayed milestone?" and "What disease can I have if I have delayed milestone?"