I lived childless in the inner sunset of SF for 10 years, from 2005 until 2015, and I've never seen such a kid unfriendly city in my life. Try pushing a stroller/pram through neighborhood grocery store aisles, or bringing them on the bus, and you'll get the sneer of your live from the people who feel like your impeding their travels. Do you live in a decent neighborhood? Well, chances are your kid won't go to a school near you. They get entered in to a lottery, and they may have to bused 2 hrs round trip across the city to go to a school in bayview, because they are trying to integrate the bad and good schools. Do you like poop? because your 2 or 3 year old will step and play in human poop as they walk down the sidewalk.
My wife and I aren't dot com millionaires, so for us, the threat of being evicted from our rent controlled apartments was too much to bear if we had a kid. We didn't like the prospect of raising a kid in a 600 sqft 'starter' home for 750k either. That money could be spent on the kids education if we moved to a more affordable place, so we did. We bought a 6 bedroom, 3500 sqft place in Austin for 300k, and had our first of hopefully 2 natural 1 adopted kids. We have a backyard with a tree house in it, there are neighborhood kids playing in the streets every night, and he will have at most a 10 minute commute by foot to the best schools in the city. All of that money we would've paid in to the privilege of an SF condo is now in his college fund. We love the bay area so much but it's not a place for kids at all.