The Wikipedia article on fetal viability gives a table giving fetal viability at each week of gestation:
So at 34 weeks the viability rate is >98%. But I'm wondering what is the viability of a full-term baby, that is, at 39 to 40 weeks of gestation? The reason I ask this is because I assume that some full-term babies don't have a 100% viability.
Also, does anyone know what viability means exactly? In the article I checked it's defined as
"The ability of a fetus to survive outside the uterus."
Fetal viability (Wikipedia article)
I'm not sure exactly what this means, because it seems to me vague. For example infant mortality rate is not vague, it specifically expresses the number of babies that die within the first year of their life, but the fetal viability measure doesn't mention a fixed time period. For example would a baby who manages to live for 6 months be considered to be viable or have been considered to be viable?