Why do mothers judge one another and their parenting?

Although mothers can provide one another with invaluable advice and understanding, they also can be quick to cut one another down, making devoted mothers feel inadequate. Though women might shrug off criticism about other aspects of their lives, many say they feel crushed when someone picks apart their parenting — the job they care about most. Often, the best thing that a friend can offer another mom is to listen. Because criticism often comes from all sides, getting support from other mothers can be vital. USA Today