They're likely correlated. Might be interesting to look at the outliers (places with low child mortality and low life expectancy after 5 and places with high child mortality and high life expectancy after 5)
I would naively say (and this is why I made that point about having two different numbers) that life expectancy after in later years is also influenced by Violence, Wars and Addiction whereas infant mortality might be more influenced by health conditions, sanitisation, presence of germs and so on...
Regardless, in an article, saying that the life expectancy is 39 years old will make people think that people die at an extremely young age when often it's mostly due to infant/child mortality. Which is why separating it would make things clearer.
