My first child is due January. I sat down with my boss about a month or so ago and told him I'm intending to take parental leave. "No problem" he said, I told him my intention was to take the full 8 weeks I'm entitled to. He didn't say anything right away to that... eventually it was more of a "...that's not typical for the guys around here" We did a bit of back and forth. (I think he went to HR to find out he can't…
An important lesson we all need to remember: there are two ways to get the time off which is owed to you, the hard way or the easy way. If your boss is really willing to make it the hard way, it's on him/her to find a train a replacement. Get out of there.
I've also seen this with vacation.... A skilled engineer saves up vacation with a well-known to the boss goal of making a 2 month adventure trip. When it's time to go, he's "too valuable" to "lose" for 2 months. He threatens to quit. Now he's "too valuable" to lose over the situation and he gets his vacation. So stupid.
Keeping yourself ready and able to change jobs is unfortunately necessary, because company loyalty is kaput, and the threat of quitting is unfortunately occasionally needed to get proper to treatment.
Unions or humane work cultures would fix this. Not holding my breath in the USA. Europe is way better.