People who have Down's... | Meaning, pronunciation, translations and examples All pregnant women, no matter what age, can be tested. Down’s syndrome usually occurs because of a chance happening at the time of conception. Down syndrome causes mental retardation, a characteristic facial appearance, and multiple malformations. Screening for Down's syndrome. When a person's genetic make-up is altered in this way, it can affect their physical and mental characteristics. Down's syndrome is caused by a fault with a particular chromosome, the 21 chromosome. During your pregnancy you'll be offered a test to detect if your baby might have Down’s syndrome. At age 45 the incidence becomes approximately 1 in 30. It occurs most frequently in children born to mothers over age 35. The age of the mother does not … Down's syndrome definition: Down's syndrome is a disorder that some people are born with. Learn more. Down's syndrome is more than just a diagnosis or definition, hear from Liam Bairstow about what having Down's syndrome means to him. Listen to Berge, this World Down Syndrome Day, discussing his life and what matters to him. "But I am so proud to be Down Syndrome, so proud." Down syndrome can affect a person’s cognitive ability and physical growth, cause mild to moderate developmental issues, and present a higher risk of some health problems. Down's syndrome is not a life-limiting condition, which means people with it will not lead a shorter life because of the condition. Down syndrome: A common birth defect that is usually due to an extra chromosome 21 (). It is rarely hereditary and nothing the parents did before or during pregnancy can have caused it. Down's syndrome definition: 1. a genetic condition in which a person is born with learning difficulties and particular physical…. A 35 year old woman has about a one in 350 chance of conceiving a child with Down syndrome, and this chance increases gradually to 1 in 100 by age 40. Down’s syndrome (Ds) is a genetic condition caused by the presence of a full or partial third copy of chromosome 21 in the body’s cells. Down syndrome occurs in people of all races and economic levels, though older women have an increased chance of having a child with Down syndrome. It is associated with a major risk for heart problems, a lesser risk of duodenal atresia (partially undeveloped intestines), and …

In most cases of Down's syndrome, a child inherits an extra copy of the 21 chromosome, meaning they inherit 47 chromosomes instead of the usual 46.