Obesity in pregnancy; is it irresponsible?

A debate about news that half of women of child-bearing age are overweight, which can cause problems for their children. Should this be treated as seriously as smoking or drinking during pregnancy? Is it irresponsible to put your child at a health risk, by being obese when you conceive? Or is it up to each mother, and what she wants? With parenting author Liz Fraser and mother Amber.