SOCIO-DEMOGRAPHIC RISK FACTORS OF SEVERE MALNUTRITION FOR CHILDREN AGED UNDER FIVE INVOLVING VARIOUS BIRTH COHORTS IN BANGLADESH Mohammad Rocky Khan Chowdhury Research fellow, Department of Population Science and Human Resource Development, University of Rajshahi, Bangladesh; Commonwealth PhD Scholar, The Graduate School, University of West London, United Kingdom;& Lecturer, Department of Public Health, First Capital University of Bangladesh Email: rurocky84@gmail.com Hafiz T.A. Khan Professor, Public Health & Statistics, The Graduate School, University of West London. London, United Kingdom Email: hafiz.khan@uwl.ac.uk Md. Nazrul Islam Mondal Professor, Department of Population Science and Human Resource Development, University of Rajshahi, Bangladesh Email: nazrulupm@gmail.com Russell Kabir Senior Lecturer, School of Allied Health, Faculty of Health, Education, Medicine and Social Care, Anglia Ruskin University, Chelmsford, Essex, United Kingdom Email: russell.kabir@anglia.ac.uk Keywords Socio-demographic, under-five child and severe malnutrition