I have a 4-5 month old kitten and I have never heard her meow. She yips, growls (when you give her food) but I have never hear her meow. Do cats develop a meow later? She was a stray and I think she was taken from her mom too early but we have other cats who meow so she had heard cats meow.
She will probably start to meow later in life and I would not worry. good luck, vetcare