OOoh, Ow and Meow

When I first introduce Lydia to the sound a cat makes, I said,  "Meow." She picked up pretty fast.  Then all the sudden stopped saying the cat sound.  I was wondering why until it hit me today.  I realized that I also taught her ooh when someone in a book is sad.  She makes that sound when she sees a clown that is sad in her circus book.   I also taught her ouch or ow when she tries to pull my hair.  She has a pair of cat socks and today she was saying a mix between all three.  It is really cute because it ends up sounding like a sad, sick cat. What do you know.  I guess the sound that the cat makes is somewhat sad.