Perinatal Death: A foetal death after 24 completed weeks gestation and before 6 completed days of life.
https://medical-dictionary.thefreedictionary.com/perinatal+death
California's AB 2223 uses the word in two occasions on its bill progress monitoring page.
https://leginfo.legislature.ca.gov/faces/billCompareClient.xhtml?bill_id=202120220AB2223&showamends=false