I had my daughter in the summer after 1L. Here are a few tips I can share:
1) Be honest and realistic about time: Don't fool yourself or your spouse, law school will consume you. Your spouse will have to be as committed to your law school as you, if that makes any sense.
2) Get help: If you have family close-by, make fixed assignments when they can take care of the baby. If no family, hire some help. Our parents helped with the baby after she was 6 mo. Before then, we hired a house-cleaner and gardener to free up some of our time. We had to stretch financially to make it happen, but I am glad we did.
3) Have fixed days/times to do things or things will fall apart: The baby will have unpredictable timing, so make sure EVERYTHING else is predictable. My partner and I had fixed days and hours of the week for cooking, laundry, grocery-shopping, and even small/quick things like loading the dishwasher and taking out the trash. Of course, the biggest chunk of time on the calendar was classes and study time. My partner and I discovered pretty quickly that things fall apart if we don't follow the schedule.