Chinese newborns in 2016 can expect 68.7 years of healthy life, compared with 68.5 years for American babies, the figures show.
American babies can still expect to live longer overall, dying at 78.5 years compared to China's 76.4. but during the last decade Americans are likely to suffer from ill health.
"The lost years of good health that are a factor in calculating healthy life expectancy at birth are lower for China, Japan, Korea and some other high income Asian countries than for high income 'Western' countries," said WHO spokeswoman Alison Clements-Hunt.
The United States was one of five nations, along with Somalia, Afghanistan, Georgia and Saint Vincent and the Grenadines, where healthy life spans beginning at birth fell in 2016, according to the WHO data, which was published in mid-May.
"Chinese life expectancy has increased substantially and is now higher than for some high-income countries," said Clements-Hunt.
The U.S. life span is decreasing, having peaked at 79 years in 2014, the first such reversal for many years, she said.
The world's longest living people are the Japanese. Babies born in Japan in 2016 were forecast to live for 84.2 years.
Comment: So what is causing this very clear decline in the quality of life experienced for the majority of Americans? And it's not just in the US: Life expectancy for poorest girls in England falls for first time since 1920s
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