What is sweet summer child?

"Sweet summer child" is a phrase commonly used in the book and TV series Game of Thrones. It is usually used to describe a character who is naive, innocent, and unaware of the harsh realities of the world. The phrase is used by more experienced characters to convey their frustration or disappointment with someone who is too naive to understand the complexities of the situations they are facing. The term originated in the book series A Song of Ice and Fire by George R.R. Martin, which the TV show Game of Thrones was based on.