Children with these conditions can have many different symptoms of down syndrome is expressed to a greater or lesser degree. All the children ahead of all the symptoms, but some conditions are very serious symptoms. For this chromosomal conditions before the symptoms of it helps to learn little. Occurs when is known by the name of trisomy 21 down syndrome, and three instead of two copies of chromosome 21, fetus to inherit. Might be diagnosed in utero detection or the baby is born. This is always to have abnormal cells they are just some of the third chromosome mosaic down and these kids are occasionally must of the small number of down syndrome, syndrome, child must. Can symptoms of down syndrome, mental retardation as that of cognitive disorder usually are included. This is the calm. Or is it more serious. Not only influence should be understood in down syndrome awareness. In addition, serious birth defects and health is available. It is most common are birth defects of heart defect is not, these often complex, and can be repaired. You have health problems and other health problems affecting the child's disease of the thyroid gland, or gluten intolerance, Trisomy 21.