What is the term little meatballs (referring to spoiled kids)? In this video One Child Policy: Last Week Tonight with John Oliver (HBO) there's a description of only children:


  little emperors or little meatballs as they're sometimes called in Chinese


These terms are referring to spoiled only kids.

Little emperor is easy: 小皇帝. But I don't think I've ever heard mention of "little meatballs." What's the original term? 小丸子? 小肉丸?

Any ideas? Where'd the term originate from?
From my life experience, there's no such phrase as "Little Meatballs". 

What children (or even some adults) use to make fun of overweight kids is "小胖墩". "小胖墩" literally means "Little Fat Chunk", and of course, it is a slang word. And here, it is more likely "小胖墩" is used to represent children been spoiled with foods since s/he is the only child.