Whether it's the fluctuating time or the baby that bothers you most, both are massive red flags. Therapy sessions should be consistent and focused on you, that's a hallmark of what therapy is about. You aren't getting what you deserve especially if she offers no explanation for either changing the length of your sessions willy nilly or bringing her baby into the room (which could be very triggering and upsetting for many clients). Your T doesn't sound very professional at all and there are far better therapists out there.