Abstract: Assembly of a diaper and a sensor for at least determining a position of a user of the diaper, wherein the diaper is provided with an insertion opening or coupling element for coupling of the sensor to the diaper, such as Velcro. Method for forming a diaper, wherein from at least a top layer, a core material and a bottom layer, at least partly a diaper is formed, such that the core material is locked between the top layer and the bottom layer, wherein the top layer is at least partly moisture-transmissive and during use is turned towards the body of a user and the bottom layer is substantially moisture-tight and during use is turned outwards, after which on the side of the diaper turned outwards during use an insertion opening or coupling element is provided.