The global increase of children obesity has recently alerted top research teams. They have focused on finding causes present already in the prenatal period, on establishing diagnostic criteria for both childhood and adolescent ages, and on seeking for methods of monitoring risk and preventing metabolic syndrome manifestations. This paper is a literature review from prestigious medical journals that monitor the development of risks from the ontogenetic point of view. The paper deals not only with the issue of obesity itself, but also all risk complications like early atherosclerosis, higher blood pressure, insulin resistance, fatty liver, or sleep respiratory disorders.