Children with severe obesity will be identified through the obesity management clinical program at The Hospital for Sick Children called STOMP (SickKids Team Obesity Management Program). The STOMP Early Years Program is a unique and intensive, paediatric obesity management program designed for 1 to 5 year-olds with severe obesity and their families. Families who participate in this study will be randomly assigned (having an equal chance of being in either group) to one of the two study groups that will run for 6 months: