However, they may have fewer features of the condition due to the presence of some (or many) cells with a typical number of chromosomes.
Children with mosaic Down syndrome may have the same features as other children with Down syndrome.
For children with mosaic Down syndrome, some of their cells have 3 copies of chromosome 21, but other cells have the typical two copies of chromosome 21.
Mosaic Down syndrome: This type affects about 2% of the people with Down syndrome. 2 This occurs when an extra part or a whole extra chromosome 21 is present, but it is attached or “trans-located” to a different chromosome rather than being a separate chromosome 21. Translocation Down syndrome: This type accounts for a small percentage of people with Down syndrome (about 3%). 2 With this type of Down syndrome, each cell in the body has 3 separate copies of chromosome 21 instead of the usual 2 copies. Trisomy 21: About 95% of people with Down syndrome have Trisomy 21. People often can’t tell the difference between each type without looking at the chromosomes because the physical features and behaviors are similar. This means that Down syndrome occurs in about 1 in every 700 babies. Each year, about 6,000 babies born in the United States have Down syndrome. How Many Babies are Born with Down Syndrome?ĭown syndrome remains the most common chromosomal condition diagnosed in the United States. Shorter in height as children and adults. Small pinky fingers that sometimes curve toward the thumb. A single line across the palm of the hand (palmar crease). Tiny white spots on the iris (colored part) of the eye. A tongue that tends to stick out of the mouth. A flattened face, especially the bridge of the nose. Some common physical features of Down syndrome include: People with Down syndrome usually have an IQ (a measure of intelligence) in the mildly-to-moderately low range and are slower to speak than other children. This extra copy changes how the baby’s body and brain develop, which can cause both mental and physical challenges for the baby. A medical term for having an extra copy of a chromosome is ‘trisomy.’ Down syndrome is also referred to as Trisomy 21. Babies with Down syndrome have an extra copy of one of these chromosomes, chromosome 21. 
Typically, a baby is born with 46 chromosomes. They determine how a baby’s body forms and functions as it grows during pregnancy and after birth. Chromosomes are small “packages” of genes in the body. It's important to choose a name you feel fits your child best.Down syndrome is a condition in which a person has an extra chromosome. Although many baby names are often separated by gender, Parents believes that sex does not need to play a role in selecting names.
0 kommentar(er)
