My daughter has Down's Syndrom and is 21 years old. Recently went for a physical and her WBC was low. Took blood again 6 weeks later and was lower than before at 3.6. Took blood again another 6 weeks later and is now at 3.4. She also has a poor appetite and is always tired. Some days she doesn't eat at all. She has lost weight as well. She has an appt tomorrow with the dr but I am anxious and would like to know what might be going on as soon as possible.