A Research Study on How Well Cagrilintide and CagriSema Work in Children and Adolescents With Excess Body Weight

Inclusion criteria: * Informed consent of parent(s) or legally acceptable representative (LAR) of participant and child assent, as age-appropriate, obtained before any study related activities. Study related activities are any procedures that are carried out as part of the study, including activities to determine suitability for the study. * The parent(s) or LAR of the child must sign and date the Informed Consent Form (according to local requirements) * The child must sign and date the Child Assent Form or provide oral assent (according to local requirements). * Male or female. * Aged 8 to less than (\<) 18 years at the time of signing the informed consent. * Body mass index (BMI), at screening, corresponding to: * Greater than or equal to (\>=) 95th percentile for children aged 8 to \< 12 years (Tanner stage 1-5) * \>= 95th percentile or \>= 85th percentile with the presence of at least one obesity-related complication including, but not limited to, type 2 diabetes (T2D), hypertension, dyslipidaemia or obstructive sleep apnoea for adolescents aged 12 to \< 18 years (Tanner stage 2-5). * Laboratory parameters, as measured by the central lab at screening, within normal sex- and age-specific ranges of total calcium, phosphate, alkaline phosphatase, parathyroid hormone. * History of at least one unsuccessful effort to lose sufficient body weight after participation in a structured lifestyle modification programme (diet and exercise counselling) for at least 3 months. * Body we…