My kitten Blossom doesn't know how to meow properly.
My son rescued her at 3 1/2 weeks, could it be because she left her mum so young & can't remember hearing other cats. She chortles softly. When she 1st started to meow she opened her mouth but no sound came out. Now she's very hard to hear. Even if she's trodden on accidentally she doesn't make much of a sound. She purrs loudly though.