I also see an alternative in 2021, even with both parents working. Just as a baby might be trained to sleep through the night, an adult can be trained to not sleep in one big chunk of 6-8 hours, but sleep in several chunks of a few hours. A little nap here and there, and some getting used to using your brain (=working) when tired is a viable alternative for me at least. While sleep is very important for ones health, having a child got me to realize that I can function with less sleep as well. This would be more in the spirit of „parents adapt to their new life as a young family“ in contrast to „the baby adapts to the parents pre-family lifestyle“. I am ready to sacrifice sleep for going out and working late, and so am I to comfort a crying brand-new descendant of mine. (Maybe I‘ll change my mind once the second baby is here ;) )