I call it the festival of life.
When my son was born (our first of three), we had been through the big day of birthing and all that happens on that day. Finally, my wife had fallen asleep and they took the baby to the nursery for the night. I decided to stop by for one last look before heading home.
I must have had a oh my god what have I gotten myself into look because and nurse came out to talk to me. She said “don’t worry, you figure this out and everything will be fine. I see a lot of first time dads with this look”. And it was. Just that you’ll not ever think just for yourself again. But I wouldn’t trade fatherhood for a million bucks.