胎内

1. Origins, structure, and basic meaning

• Structure: 胎内 (たいない) is a literary noun for the inside of the womb during gestation.
• Basic usage: 胎内の赤ちゃん modifies a baby by its location during growth, while 胎内で聞いた音 marks the place where a story imagines an auditory memory forming.

2. Common pitfalls and similar expressions

• Location modifier and event setting
  • In 胎内の赤ちゃん, の expresses a location relation; in 胎内で聞く, で marks the setting of hearing. The second example does not scientifically assert that such memory is possible.