Claire Marie Porter/Undark
More from Claire Marie Porter/Undark
![Umbilical cord knot seen on screening images](https://www.popsci.com/wp-content/uploads/2021/07/08/umbilical-cord-knot.jpg?w=800)
Health
What umbilical cord tests can and can’t tell us about stillbirths What umbilical cord tests can and can’t tell us about stillbirths
By Claire Marie Porter/Undark
July 9, 2021