Trisomy 21 is a type of Down's Syndrome.
Heart: 50% of DS children will have congenital heart disease.
Mind: Most kids will have a 30-70 IQ, but some may experience moderate DS, which will result in an IQ of 10-30. If the child lives to be in his or her 40's or 50's, they will most likely experience Alzheimer's disease.
Fertility: Most men with DS have a low sperm count, and woman have many miscarriages, pre-mature births or have difficulty with labor.
Senses: About 37-78% of DS/Trisomy 21 children experience hearing and sight problems.