Down syndrome (Downsyndrome is the most common chromosomal abnormality in live births. It is the most common form of mental retardation (mental retardation) caused by chromosomal aberrations that can be confirmed by microscopic examination. Down syndrome is characterized by a variety of cosmetic dysmorphic features, congenital malformations, and other health and medical problems. Appearance MalformationsThe unique appearance malformations characteristic of Down syndrome primarily affect the head, neck, and limbs. 10 Unique Appearance Dysmorphic Features are common in newborns with Down syndrome and are usually recognized soon after birth. Mental Retardation Almost all individuals with Down syndrome have cognitive impairment, although the degree of cognitive impairment varies widely. Most are mildly to moderately mentally impaired, but some are severely impaired. Behavioral and psychiatric disorders are more common in children with Down syndrome than in normal children, but are less common than in those with other causes of mental retardation. Heart Disease About half of people with Down syndrome have congenital heart disease. Septal defects are the most common. Some adolescents and adults with asymptomatic, nonstructural heart disease can develop heart valve abnormalities. Gastrointestinal Malformations Children with trisomy 21 are at increased risk for gastrointestinal malformations, including duodenal atresia or stenosis, anal atresia, and esophageal atresia with tracheoesophageal fistula. They also have an increased risk of celiac disease and Hirschsprung disease. Birth Babies with Down syndrome have lower birth weight, length and head circumference than normal babies. Children with Down syndrome have a slower rate of height gain than normal children. Typically, infants with Down syndrome weigh less than expected for their corresponding length, and later disproportionate growth causes most children to become obese between the ages of 3 and 4. Eye Problems and Hearing Loss Eye disorders are common in individuals with Down syndrome and the incidence increases with age. These include refractive errors, strabismus, nystagmus, cataracts, and conical corneas. Hearing loss is also common, and otitis media is a common problem. Endocrine Endocrine abnormalities in individuals with Down syndrome include thyroid insufficiency and type 1 diabetes mellitus. Hematologic abnormalities involving red blood cells, white blood cells, and platelets are common in individuals with Down syndrome and include erythrocytosis, macrocytosis, leukopenia, thrombocytosis, and leukemias (transient, acute megakaryocytic, and acute lymphoblastic leukemias). Reproduction Women with Down syndrome are fertile and may become pregnant. Almost all males with DS are infertile. Urinary abnormalities, arthropathy, lung disease, and skin disease The rate of urinary abnormalities is increased in patients with Down syndrome, and arthropathy, lung disease, and benign skin disease are also seen. Atlantoaxial instability Individuals with Down syndrome are at increased risk for atlantoaxial instability (AAI), defined as hypermobility of the atlantoaxial (C1) and cardinal (C2) joints, however spinal cord compression due to cervical subluxation is uncommon. Immunodeficiencies Down syndrome is associated with several immune impairments that are thought to be related to increased susceptibility to infections, autoimmune diseases, and malignancies. However, these defects have not been consistently demonstrated. Whether these defects indicate a primary immunodeficiency or a premature failure of the immune system is uncertain. Screening Down syndrome is usually diagnosed through prenatal screening. Down syndrome is also recognized in the neonatal period due to its unique phenotypic characteristics. Finally, we wish you all the best for a healthy baby!