To clarify: I'm interested specifically in what ancient sources thought the child-in-the-womb might be experiencing, if anything, or what agency was ascribed to it, if any. These days it is assumed that later in the pregnancy fetuses can 'hear' garbled sounds from outside, for example, and there are common references to "the baby wants X!" when a woman experiences certain cravings while pregnant.

I've gone over Pliny the Elder and his references to pregnancy don't seem to cover this. I'm sure it might also be the case that "we don't have sources on that".

Thank you, I appreciate any insight into this!