What to do if i want to work with babies/ young children that have turner syndrome. what kind of doctor or nurse, or specialist would that be.?

Hard to define: These kids need primary care doctors, geneticists, endocrinologists (hormone docs) and people who work with learning disabilities. You will find their numbers are not great in a given town at any one time, so if you are planning a field of study that would help them, you will need to broaden your scope to include many other diagnoses.