For what it's worth, Google, or at least some subsegment, does seem to be trying to fix this issue. I had a somewhat offensive conversation with a recruiter recently where they told me they're looking for people (like me) with non-standard backgrounds who don't necessarily have the pedigree that the usual Google SWE hire has. I hope they also extend this thinking to moms with young children. I know a good many technical women who fell off the career ladder after having children and were never seem to be able to get a chance to get back on, ultimately taking jobs far beneath their abilities or just shifting industries altogether.