"The gender pay gap for young women now is virtually non-existent, but once you have a child it widens considerably - which is partly about the choices women make but has a lot to do with employer's attitudes."
But that's my point, it's not a choice for women to take that gap in their career, it's certainly not a fair choice between the mother or father doing it anyway.
Many parents, myself included, have to sit down and work out what their plans are going to be.
If the father takes a gap then he'll get two weeks off and after that he'll be out of a job.
If the mother takes a gap then she'll get some form of pay for 9 months and then the ability to return to her job, with the rights to try to change her hours, after a year.
For many couples the "choice" is obvious, it's got to be the mother who takes that gap.
And this just reinforces the gender biased roles that childcare is woman's work and that the man should be the one working to support a family.
Do what the Scandinavian countries do have real gender equality allowing couples to decide how to work their time out and you'll see the benefits. Some mothers will continue to take the gap, and that will then be their genuine choice rather than their only financial option, while others will return to the workplace sooner while the father lets his career take a hit. And it's in those countries that the gender pay gap in the work place is the smallest.