I totally disagree with your comment of childcare having increased compared to the Boomers' time. Maybe it has compared to the Gen X time, but that is irrelevant to your comment.
In the Boomers' time it wasn't socially acceptable for women to work so few did and the ones who didn't took care of the children. Looking at the lost income potential of one parent not working to stay at home and provide childcare is far more than the cost of childcare today.