Place it at the very beginning of an edit, ahead of the main footage, then follow it with a background tune or a short reaction clip once the scene starts. Keep it as the opener rather than burying it mid-edit, so the greeting frames everything that follows.
About this sound
A small child says hi twice, then wishes the listener good morning in a bright, sing-song voice across about five seconds. The tiny, excited delivery feels instantly sweet and innocent, turning a plain greeting into a warm little lift. That simple charm makes it easy to recognise and hard not to smile at when it opens a clip.