More women than ever are having babies at the peak of their careers. When will we stop punishing them for it?

During childbearing years, changing jobs - even for a fundamentally better gig - can be a very bad idea. Those prime childbearing years - mid-twenties to early forties - overlap precisely with prime professional years. This is when employees are most attractive to new employers, when they should be able to zip up ladders with the most alacrity.

In 2013, according to the Bureau of Labor Statistics, around 64 percent of mothers with children under six worked.

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