What defines a "Live birth"?

A "Live birth" is defined as an expulsion from the mother with evidence of life at the time of birth. This typically means that the newborn shows signs of life, such as breathing, heartbeat, or muscle movement. The defining characteristic here is the presence of life at the moment of delivery, which distinguishes a live birth from stillbirths or other forms of loss.

In the context of the other options, while reaching full term is a typical expectation for many pregnancies, it does not necessarily indicate that the baby is born alive. Additionally, the absence of complications during birth does not define the outcome in terms of life or death; thus, a live birth could occur with or without complications. Finally, the mention of an expulsion occurring after 20 weeks is often related to legal definitions surrounding viability but does not itself ensure that the birth is classified as a "live birth."