When we found out she was pregnant, we decided that she would leave her high stress job, take a few months off after birth and then look for a job with flexible hours. So after losing her full time income, we adjusted our spending down to just one income.
The first part time job she found had no benefits and the commute was brutal, so she worked there for a month and kept looking for something better. She finally found a local job where she can set her own schedule, picking up one or two days a week. When I found out it also included benefits, I logged into their site and was surprised that they allowed us to contribute 100% of her income to the retirement account. With the limited hours, it might not get maxed out this year (I'm guessing around $12k for the year), but it feels good to put all of her income into a tax advantaged account. My long term goals are much clearer now than they were a couple years ago. I guess that's what happens when you have a baby.