I've often said, my memories of my life before kids are all in black and white, and after, in color.
My oldest is 24, my youngest 18. My advice is "don't blink."
A new child shows up every 2 weeks...for decades.
My wife and I were outnumbered after the first one, but didn't realize it. We thought we had the hang of it, and then the second one showed up with a totally different User's Manual.
And just when you think you have it figured out, they kick you out of management and make you grandparents.
But no fear; 10,000 years of human history, 500 generations, and each one raised by rookie management.
Somehow, it works.