Final answer:
The central idea of the text is the exploration of a child's growing awareness of the world, relationships, and language. It highlights the child's attempts at language and the categorization of their knowledge. The mention of the Vances suggests an advancing awareness on the part of the child-narrator.
Step-by-step explanation:
The central idea of the text "Picked baby's name? Not so fast, in Denmark" is the exploration of a child's growing awareness of the world, relationships, language, and the development of the child's facility for language. The text depicts the child's attempts at language through nonsensical lines of song and highlights the categorization and order imposed by the child as they gain knowledge about the world. The mention of the Vances and the "different father and mother" suggests an advancing awareness on the part of the child-narrator.