United Nations Secretary General Ban Ki-moon has said the "UN will do everything in its power to overcome malnutrition."
He added: "We must empower women so they are well nourished before and during pregnancy so they can breast feed."
The UN chief was talking via video link at an international meeting in London with charities and companies, aimed at combating malnutrition in the developing world.
David Cameron is due to talk shortly.
More top news
The term 'photobomb' has been named the Word of the Year 2014 by lexicographers at Collins English Dictionary.
A Swiss supermarket has apologised for its "unforgivable blunder" after selling coffee cream with pictures of Hitler and Mussolini on.
The Tonight programme looks at government efforts to improve our general wellbeing, and offers tips on how we can all boost our happiness.