Not every child with Down Syndrome has these outward physical appearances, but they are clues: Flat facial profile Slightly flattened bridge of nose; small nose Highly flexible Low muscle tone Head...
It is also known as trisomy 21 (trisomy= 3 copies of one of the chromosomes, the 21 just describes which chromosome has the trisomy).
its when the chromosomes 21 make a 3rd chromosome . i does not split causing it to have 3 chromosomes on one egg. this can cause down syndrome .
well i think if your throwing up blood, bruising and bleeding easily, and y.
blood in your pee or kidney stones but you should talk to a doctor and get tested