You are carrying a fetus with trisomy 21 i.e. fetus with Down syndrome. Human cells normally contain 23 pairs of chromosomes, half of which are inherited from each parent i.e. one chromosome in each pair comes from your father, the other from your mother. Down syndrome occurs when there is one extra copy of chromosome 21 in cells in the body. The extra chromosome 21 material may affect the physical development and learning abilities of people with Down syndrome. People with Down syndrome may share certain physical characteristics as a result of the extra chromosome. However, each child also inherits many family features, traits and characteristics. Most children and adults with Down syndrome are healthy. However, it is established that people with Down syndrome have a higher incidence of certain health issues such as congenital heart disease, mental retardation, susceptibility to infection, hearing, vision, thyroid and respiratory problems, obstructive digestive and neurological problems and leukemia. Thanks