Prenatal Testing
Most prenatal tests are performed on women 35 years and older as the risk for a chromosomally abnormal pregnancy increases with the mother's age. This is related to the age of a woman’s eggs, which were already completely formed during the fetal period before she was born herself and, if she gets pregnant later in life, there is a greater chance of chromosome errors happening while an egg matures and awaits fertilisation.
The chromosomes of your baby can be tested by:
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Amniocentesis: a sample of the fluid surrounding the baby (from 15- 19 weeks gestation).
Only a qualified practitioner can collect these samples.