MONTROSE, Mo. — It took Samantha Lesmeister’s family four months to find a medical professional who could see that she was struggling with something more than her Down syndrome. The young woman, known ...

Individuals with Down syndrome are at increased risk of heart disease, researchers said this week. The developmental disability is caused when a person is born with an extra chromosome, and can affect ...

Individuals with Down syndrome who survive into adulthood face the additional challenge of early-onset dementia, in which toxic amyloid plaques build up in the brain. The condition is strikingly ...