Depends on what 'have it all' means to you.
Can you have everything you want, exactly when you want it? No, because one can.
Can you have a full on career, spend as much time with your kids as a sahp, see your friends 2-3 nights a week, never miss a work night out, spend loads of time with your partner, hit the gym most day etc. No. Because, again, no one can.
People can feel they have it all, but other people will think they don't. I don't have the glittering social life with lots of nights out every month. But I do have a family and a good job. I have a fairly quite life and think I have all I want.
When I became a single parent and the kids were young, I couldnt keep my foot on the pedal with my career I needed to focus on my home life. Now they are older I can focus on my career again.
But even then when the kids were young I felt like I had it all. Because it was what I wanted and needed at the time.
Its absolutely possible to have a great career and move up and have kids. But you can't also get those months of experience, of you aren't in work. Any one taking a large amount of time off work, will miss out on something. You can have the career and kids. But you can't be there if you aren't there.
The more kids you have, the harder it tends to be and you do need support form either you partner or paid support.
Op if you want this experience, there's a choice you have to make. Either pass it up OR take a very short mat leave. It may be frustrating for you, but it is your choice. And there's no shame in deciding one or the other.