The prevalence of childhood obesity is a growing public health concern which is only expected to increase in the forthcoming years1. Previous studies have shown that children who become obese are at much higher risk of disease in later life, such as diabetes, hypertension and coronary heart disease2. Along with lifestyle factors such as physical activity and diet, there is mounting evidence that genetic factors also contribute substantially towards early life adiposity. Research to better understand this genetic component therefore holds considerable potential in terms of preventive strategies.