I dont know if this is really "behavior" but my kitten who is about 13-14 months old, doesnt meow. She squeaks. If I have her in my room with the door closed all night, she sleeps with me but a soon as I wake up she jumps down and goes to the dor and makes short, tiny squeeks. Sometimes if she really wants out she will let out a long, pitiful sounding squeek. She does this in the kitchen too when she wants to be fed. She even does this when I go to the bathroom and I dont let her in. Ill be in the bathroom and she will sit outside the door and squeak.