This becomes, in turn, a morula, blastocyst, embryo and fetus. After birth, the fetus is a newborn. Pro-lifers describe all stages of development after fertilization as a baby. A period lasting nominally 3 months. A human pregnancy is often divided into three trimesters, from fertilization to birth.
Laws restricting abortions often differ among the trimesters.
A process by which an morula, blastocyst or embryo divides in half to produce twins with identical genetic makeup. The ability for the developing fetus to live on its own if it were delivered by cesarean section or by normal delivery. This typically occurs sometime after the 21st week after conception. Abortions are allowed by various state and provincial Medical Associations only prior to viability. Copyright 1997 to 2000 incl.