18. Calls upon all States to take all necessary measures to ensure the right of the child, without discrimination, to the enjoyment of the highest attainable standard of health and to develop sustainable health systems and social services, to ensure access to such systems and services without discrimination and to pay particular attention to adequate food and nutrition to prevent disease and malnutrition, to prenatal and post-natal health care, to the special needs of adolescents and to reproductive and sexual health;