Average lifespan is a terrible metric for quality of healthcare. There are dozens of confounding factors that can reduce lifespan even in the presence of high quality healthcare.
Child mortality is even worse. Not all countries count neonatal deaths the same. In many countries premature babies that die are "stillborn" and not counted.
In the US, very, very premature babies are resuscitated and if they pass away, are averaging "zero" into the stats. So in fact, aggressive medical care in neonates can actually make mortality measures worse.
The popularity of the infant mortality indicator notwithstanding, international variations in birth registration laws and practices have the potential to bias comparisons of infant mortality. Problems can arise from differential registration of live births and stillbirths, especially births occurring at the borderline of viability (e.g., gestational age <22 weeks or a birth weight <500 grams, who typically do not survive the neonatal period), and/or their classification as stillbirths versus live births
Average lifespan is a terrible metric for quality of healthcare. There are dozens of confounding factors that can reduce lifespan even in the presence of high quality healthcare.