I would think that something in the field of education would be the best fit for you skills, experience, and schedule. Unfortunately most childbirth classes are given on evenings and weekends so trying to do that to make a living would mean a lot of time away from your kids when they're home. If you were a doula - or perhaps a midwife? - you would still have a crazy schedule attending deliveries but for routine appointments, those would be during the day.
When I think about choosing in relation career and family, my first reaction is that there is no choice for me. I am the breadwinner, I always have been and always will be. My job carries the higher salary and all of our benefits so it's not optional.
Thinking back though, of course there have been choices along the way. When I found myself pregnant right out of college, I put my plans of working in the media and going to grad school aside and took a management job with my university's dining services contractor because it paid OK, had health insurance, and I had a good employee track record there already from having been a student employee so I knew that my colleagues and managers would be supportive during my pregnancy. I worked crazy hours, though, so when my son was born, they found me an office position and worked 4, 10-hour days so that I could be home with my son more and avoid daycare (my mom watched him while I worked).
When my baby was older, I was ready to work 5 days a week and closer to home, so I took a corporate job in a new field that had good pay, benefits, and a short commute. I almost didn't care what the job was. Well 14 years and several promotions later, I'm still there in a fairly senior role doing really interesting work with smart people.
After my youngest son was born 7+ years ago, another manager wanted me to join her team so she offered me FT work from home. I didn't want the job but used the offer to negotiate 3 days at home (and a raise LOL) with my own boss. I still have that schedule, which allows me to be here when they come home from school, take care of errands during the day if needed, etc.
Six years ago we needed more income so I joined a test prep company as a classroom instructor and private tutor. It does take me out of the house several evenings a week and weekends, but the time out is worth it for now because it allows us to pay for expensive sports like hockey and martial arts and to save up for vacations, holiday gifts, etc. I was promoted with that company this year to expand my job to giving special presentations and running all-day courses. The work is a grind but the pay is great, so we make it work.
I guess my (long-winded) point is that you can't really map out everything, but you make a decision based on the info and opportunities before you and stick with it until it doesn't work any more, then evaluate more info and the next opportunity. Hope that helps somewhat!