I thought I recalled reading in the past that babies actually can't see very far in the newborn stages. The fact that the areola and nipple are super high contrast to the surrounding skin and whose dimensions are optimally situated for a babies focal length is a mark of that. Scent and sound play large roles in the early stages. Our baby would respond to her siblings voices since she's heard and played with them since in utero. It would make sense that the most capable sense would develop more utility. I recall reading a story where a musician was said to have dived into a new body of work to study some cello concerto or something he's never been exposed to or learned before. But as he dived into it he found it all so strangely familiar. He brought that up to his mother of this strange dejavu like experience and she had then told him that when he was in the womb she was vigorously mastering that piece herself.