Tracy Jennifer Butler is the artist and author responsible for the creation of Lackadaisy. When she's not working on Lackadaisy (I know, right?) she works as a 2D and 3D artist on stuff that has nothing to do with Lackadaisy. You can find out more about that by looking it up on her FAQ. Tracy has worked with digital art for over 10 years.
In regards to her professional history-
I worked as a orthodontic lab assistant/clinician from age 14 up through my college freshman year. In the likelihood you're asking about art related jobs, though, my first paid jobs were sporadic freelance illustration gigs - some for table top RPGs, but mostly for individuals who simply wanted some artwork done. I was about 16 or 17 when I started doing that.—Tracy, 
Her thoughts on holding babies herself are summed up in "Loaf Baby".
In the comic
Tracy has created a fictionalized version of herself. In several of the Previews, Tracy interviews various Lackdaisy characters, attempting to learn the answers to questions that have been posed to her by fans of the comic.