A survey of almost 2,000 UK working mothers found that most didn't bother making a formal complaint about unfair treatment. Half of those polled...said they felt left out or not taken seriously at work after having a child, while two out of five believed younger colleagues with no children were given more support and encouragement. Three out of five said they believed pregnancy was a problem for their workplace and a third found it "impossible" to climb the career ladder after giving birth.