Answer: Prenatal blood tests
Step-by-step explanation:
There is a more chance of occurrence of down syndrome in baby of the mother who are more than 35 years of age.
The prenatal blood tests of the child will led to the confirmation whether the child is suffering or not.
Before the prenatal blood tests there is no way for this confirmation. The tests of mother and father can only be used to find the chances of the baby suffering from down syndrome.