More than 1 in 4 deaths of children under 5 years of age are attributable to unhealthy environments, according to two new World Health Organization (WHO) reports, which note that indoor and outdoor air pollution, second-hand smoke, unsafe water, lack of sanitation, and inadequate hygiene take the lives of 1.7 million children under the age of 5.

An expert panel sponsored by the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health, has issued clinical guidelines to aid health care providers in early introduction of peanut-containing foods to infants to prevent the development of peanut allergy.