What are the best ways you can lower the risk of having a baby with down syndrome?

Conceive younger age. As females get older the likelihood they will have a child with trisomies , such as down syndrome increases. So, the younger the egg cells the lower the risk for down syndrome. There are tests that can be done during early pregnancy that would detect if fetus has down syndrome, and some couples choose to terminate pregnancy.
Testings. Screening tests to assess your chance of having a baby w down's. Diagnostic tests eg amniocentesis and chorionic villi sampling that will give you a definite diagnosis of down's & other abnormalities.Your doctor will explain what is involved & offer counselling.Risk of having a child w down's increases as a woman gets older . Down's kids have potentials and very loving.Make a wise decision!