Unlike licensed cartoon effects, this type of short baby clip spreads through personal soundboards and family video edits where a second child is the joke or the surprise. Creators reuse the same few seconds because the coos are instantly readable even on mute-adjacent phone speakers and need no explanation. It sits in the same editing toolbox as other tiny reaction sounds, used to mark a new arrival, undercut a chaotic moment with something sweet, or signal that a story is about to get more personal and domestic.