You’re at Starbucks, enjoying a jolt of caffeine with a friend, when a little girl, about four, begins a red-faced stomping tirade. As she screeches at her mother, your friend tells you, “Her mom just had another baby.” What’s your reaction? Now imagine a different scenario. Your friend tells you this girl is an only child. Most people, on learning this news, will form a more negative assessment, blithely applying labels like “spoiled” or “selfish”.