How have you managed this (with or without external help)?
I also have colleagues where both spouses work during the day. One colleague went to 3 days a week, her husband went to 4 days a week, and they had a family member cover the other day.
One thing that tends not to work is both spouses working full-time and expecting to juggle child care on top of that. It can work occasionally, like when the child is sick, but it's not sustainable.