Experts say climate change and harmful advertising encouraging fast-food consumption and under-age drinking are putting children at risk.
The UK was ranked among the top 10 countries in the world for the overall health and well being of children.
The report by the WHO, the United Nations Children’s Fund (UNISEF) and the Lancet commission ranked 180 countries on the likelihood of a child being able to “flourish”, focusing on health and well being factors such as education, nutrition and child mortality.
Some 40 child-health experts warned progress over the past two decades was “set to reverse” if radical changes were not made by governments around the globe.
“Every child worldwide now faces existential threats from climate change and commercial pressures,” said former Prime Minister of New Zealand, Helen Clark, who co-chairs the commission.
Helen added that “Countries need to overhaul their approach to child and adolescent health to protect the world they will inherit in the future”