Background: The judicious use of the world health organization (WHO) guidelines in the management of severe acute malnutrition (SAM) is very crucial in avoiding complications. We investigated the incidence of refeeding syndrome and its associated factors in children under 5 years with SAM receiving treatment as inpatients. Methods: A prospective study of 104 children with SAM admitted to the paediatric unit of Dr George Mukhari Academic Hospital (a teaching hospital in Pretoria, South Africa) since March 2014 to March 2015 was conducted. On admission, history on socioeconomic status and co-morbidities, a comprehensive clinical examination, and anthropometric measurements were obtained. All the patients were managed using the 10 steps of management of malnutrition with cautious feeding and broad spectrum antibiotics being instituted. Bloods were taken for calcium, magnesium, phosphorous, urea, and electrolytes on admission and compared to repeat bloods done on day 5 post admission.