Please see my general response to all the negativity I've received here [0].
To address your specific point, though, which was echoed by others in this thread, there is a lot of truth to the human ability to hone their auditory memory, especially when it comes to sounds that fall within the human auditory frequency range. Many of us have experienced this phenomenon not only with their own and others' children, but also with their house pets (especially cats and parrots), and even machines (i.e., your car, your air conditioner, your server, etc.)
Nonetheless, as I have shown, there is a particular biological difference exhibited between first-time mothers and first-time fathers. Nothing about this statement invalidates or calls into question your own statement and I agree with it wholeheartedly.
I taught kindergarten for five years and I was able to identify more than 30 children’s voices whether they were speaking out making some unidentifiable utterance. Humans are really good at distinguishing very small differences in the vocal range of sounds.
To address your specific point, though, which was echoed by others in this thread, there is a lot of truth to the human ability to hone their auditory memory, especially when it comes to sounds that fall within the human auditory frequency range. Many of us have experienced this phenomenon not only with their own and others' children, but also with their house pets (especially cats and parrots), and even machines (i.e., your car, your air conditioner, your server, etc.)
Nonetheless, as I have shown, there is a particular biological difference exhibited between first-time mothers and first-time fathers. Nothing about this statement invalidates or calls into question your own statement and I agree with it wholeheartedly.
[0] https://news.ycombinator.com/item?id=26254581