When I adopted my cat, he only made squeaking sounds. He sounded like a kitten but I was told he is 3 years old. Just recently (today) when we came home, instead of just squeaking at us, he started to make real meowing sounds at us. I've raised cat's all my life, but usually around 6 months to a year old, they seem to settle on their meow. I did some googling and all I can find are articles about if the cat stops meowing or goes from a meow to a squeak, but not the other way around. Any insight?
As a note as well, we've been "conversing" with him for a while. Meaning, we meow at him when he squeaks at us. And he seems to like it.