A congenital heart defect is a type of congenital heart disease. It is a structural difference present from birth. Learn more here. Prader-Willi syndrome is a genetic condition that causes physical, mental, and behavioral problems, as well as a constant urge to eat. People with the…. What is mosaic Down syndrome? Medically reviewed by Alana Biggers, M. Share on Pinterest A child with mosaic Down syndrome may have some of the health issues of a person with trisomy 21 Down syndrome.
Life expectancy. Latest news Could 'cupping' technique boost vaccine delivery? Scientists identify new cause of vascular injury in type 2 diabetes. Adolescent depression: Could school screening help? Related Coverage. What is DNA and how does it work? What to know about Down syndrome. Medically reviewed by University of Illinois.
Half are from the father and half are from the mother. But sometimes an error occurs when the 46 chromosomes are being divided in half. An egg or sperm cell may keep both copies of chromosome number 21, instead of just 1 copy. If this egg or sperm is fertilized, then the baby will have 3 copies of chromosome number This is called trisomy Sometimes the extra number 21 chromosome or part of it is attached to another chromosome in the egg or sperm.
This may cause translocation Down syndrome. This is the only form of Down syndrome that may be inherited from a parent. A rare form is called mosaic trisomy This is when an error in cell division happens after the egg is fertilized. People with this syndrome have both normal cells and some cells with an extra chromosome number This risk increases with each year of age, especially after age But younger women are more likely to have babies than older women.
So most babies with Down syndrome are born to women younger than Chromosome problems such as Down syndrome can often be diagnosed before birth. This is done by looking at cells in the amniotic fluid or from the placenta. This is a noninvasive prenatal screening. These tests are very accurate. Fetal ultrasound during pregnancy can also show the possibility of Down syndrome. Problems from Down syndrome may not be seen with ultrasound.
After birth, your baby may be diagnosed with a physical exam. The healthcare provider may also take a blood sample. This is checked in a lab to find the extra chromosome. There is no cure for Down syndrome. But a child with Down syndrome may need treatment for problems such as:.
Heart defects. About half of babies with Down syndrome have heart defects. Those cells with 47 chromosomes have an extra chromosome Mosaicism is usually described as a percentage. Typically, 20 different cells are analyzed in a chromosome study. A baby would be said to have mosaic Down syndrome if:.
Services early in life will often help babies and children with Down syndrome to improve their physical and intellectual abilities. Most of these services focus on helping children with Down syndrome develop to their full potential. These services include speech, occupational, and physical therapy, and they are typically offered through early intervention programs in each state.
Children with Down syndrome may also need extra help or attention in school, although many children are included in regular classes. The views of these organizations are their own and do not reflect the official position of CDC. Skip directly to site content Skip directly to page options Skip directly to A-Z link.
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