Mosaic Down syndrome is a variant of Down syndrome. Down syndrome is a congenital (present at birth) genetic condition that occurs when a person has three copies of chromosome 21 instead of two ...

While Emma has Down syndrome — specifically a rare type called Mosaic Down syndrome — some people don’t believe it. “At the hospital, doctors and nurses kept saying, ‘She doesn’t look ...

Once Zambelli was tested, it came back positive for mosaic Down syndrome, or trisomy 21 mosaicism/mosaic trisomy 21. According to the Stanford Children's Hospital, this form of Down syndrome is ...