What about a week-end job? Do you have a good eye for photography? Semi-professional wedding photographers can make good money these days. When we married 10 years ago, we paid a SAHM/photographer around $700 for a day of work. Of course, she had to do some work after the fact as well, but you could possibly earn all your money in one week-end. It would be a stressful week-end, but this would enable you to not stress the rest of the month.
Of course, you would need a very good digital camera, a website, and some printing equipment, but it's a thought.
I can make around $1,000 a month doing freelance editing and writing, but I absolutely cannot work with the baby around. I have him in daycare part-time.