Lil Arroyo is almost certainly listening up by now. In fact, loud noises — the dog barking, the doorbell ringing — will actually startle our baby (and also get him used to such noises; for instance, fetuses who regularly hear a dog barking will become babies who sleep right through Fido's outbursts).
Our baby's eyes (which have fortunately finished their migration to the front of his head) are making small side-to-side movements and can even perceive some light, though the eyelids are still sealed. And since practice makes perfect, he is sharpening his sucking and swallowing skills. In fact, most of the survival reflexes that our baby will have at birth are being perfected in utero right now.
And here's some proof that he is truly one of a kind - within the next week or so, the pads on Lil Arroyo's fingertips and toes will become adorned with completely individual swirls and creases (aka fingerprints).