Key points from article :
A new study released by the US National Centre for Health Statistics (NCHS) found an American baby born in 2016 can expect to live 78.6 years.
Estimated lifespan of American children drops for second consecutive year for the first time since 1963.
Experts have expressed concerns over the sharp rise in the number of drug-related deaths.
The study also revealed heart disease and cancer remain by far the biggest killers in the US.
