Welcome, KramersMom! Yep, our Toto makes a sound similar to that ... don't have a cat, but I have heard newborn babies sound like that. She does it when she is comfy and snuggling or if she is having to do something she doesn't want to do, i.e. ... bath, crate, etc. At those times, we say she is whining!! It's definitely a heart melting sound!!