A Study to Test How New Long-acting Insulin (Insulin Icodec) Works in the Body of Children and Teenagers

Insulin icodec is a new medicine which is under development for use in humans and is not yet available at the pharmacy. It is being developed for the treatment of diabetes, a condition that causes high blood sugar levels. Insulin icodec will be investigated in participants with type 2 diabetes. Participant will get one dose of insulin icodec, which will be administered in the afternoon or evening of the day of dosing. The study will last for about 8 weeks. Insulin icodec will be injected into a skin fold with a small needle (subcutaneous application) using a pen injector prefilled with a volume of 3 milliliter (mL) (a little less than a quarter of a teaspoonful). The amount of insulin icodec participant will receive depends on participant's body weight. Participant must not participate if participant meets certain conditions called exclusion criteria, such as an age of above 18 years when the informed consent is signed or has serious health conditions. Female participant cannot take part if she is pregnant, breast-feeding or planning to become pregnant during the study period.