Fetuses diagnosed with Down syndrome face a substantially higher risk of miscarriage or stillbirth.
"So, children with Down syndrome face a much higher risk of miscarriage or stillbirth. 6 months was a stillbirth." (said at 1:52:14)
No relevant studies evaluating the rate or risk of spontaneous miscarriage or stillbirth in fetuses diagnosed with Down syndrome were fetched within the search limit. Consequently, the claim could not be verified directly against retrieved abstracts, though this does not prove the claim is false.