Thurston County Coroner Gary Warnock says a forensic anthropologist couldn't determine whether the baby was alive when the 16-year-old mother gave birth. Warnock says the anthropologist found no evidence the infant had suffered trauma.
Police have said that the mother told investigators the baby was stillborn, and that she and the infant's 16-year-old father buried the child near the father's home.
The Olympian newspaper says the mother disclosed the pregnancy to a high school nurse in October while being seen for an unspecified medical issue. The nurse notified authorities, and sheriff's deputies recovered the baby's remains in the home's front yard that day.