A/RES/70/138 The girl child 17. Calls upon States to strengthen research on families and household formation and structure, with a particular emphasis on the existence of de facto child-headed households and the long-term economic and psychological impact that being a child head of a household or a child raised by another child has on children and on social sustainability; 18. Also calls upon States to strengthen research, data collection and analysis on the girl child, disaggregated by household structure, sex, age, disability status, economic situation, marital status and geographical location, and improve gender statistics on time use, unpaid care work and water and sanitation in order to provide a better understanding of the situations of girls, especially of the multiple forms of discrimination that they face, and to inform the development of necessary policies and programme responses, which should take a holistic age-appropriate approach to addressing the full range of the forms of discrimination that girls may face, in order to protect their rights effectively; 19. Urges States to take all measures necessary to ensure the full enjoyment by girls with disabilities of all human rights and fundamental freedoms , on an equal basis with other children, and to adopt, implement and strengthen appropriate policies and programmes designed to address their needs; 20. Urges all States to enact and enforce legislation to protect girls from all forms of violence, discrimination, exploitation and harmful practices in all settings, including female infanticide and prenatal sex selection, female genital mutilation, rape, domestic violence, incest, sexual abuse, sexual exploitation, child prostitution and child pornography, trafficking and forced migration, forced labour and child, early and forced marriage, and to develop age-appropriate, safe, confidential and disability-accessible programmes and medical, social and psychological support services to assist girls who are subjected to violence and discrimination; 21. Calls upon all States to enact and enforce the necessary legislative or other measures, in cooperation with relevant stakeholders, including the p rivate sector and the media, to prevent the distribution over the Internet of child pornography, including depictions of child sexual abuse, ensuring that adequate mechanisms are in place to enable the reporting and removal of such material and that its creators, distributors and collectors are prosecuted, as appropriate; 22. Urges States to formulate or review as needed comprehensive, multidisciplinary and coordinated national plans, programmes or strategies to eliminate all forms of discrimination and violence against women and girls, which should have dedicated resources, be widely disseminated and provide targets and timetables for implementation, as well as effective domestic enforcement procedures through the establishment of monitoring and evaluation mechanisms involving all parties concerned, including consultations with women’s organizations, giving attention to the recommendations relating to the girl child of the Special Rapporteurs of the Human Rights Council on violence against women, its causes and consequences, and on trafficking in persons, especially women and children, and of the Special Representative of the Secretary-General on Violence against Children; 23. Also urges States to ensure that children who are capable of forming their own views have the right to express those views freely in all matters affecting them, with the views of the child being given due weight in accordance with the age and maturity of the child, to ensure that this right is fully and equally enjoyed by the girl child, to meaningfully involve girl children, including those with special needs, as well as girls with disabilities, and their representative organizations in decision 8/12