Giving birth to my son, they put him on my chest for about 5 seconds then snatched him up and an entire team of medical types crowded around him working in complete silence. He wasn't breathing. I got to see him for all of 3 seconds, and only heard a couple of weak cries before they rushed him to the NICU. Two hours later they came up to tell us he was on a ventilator and not doing great, they suspected a heart defect and were going to helicopter him to the closest children's hospital (about 90 miles away). We did not get to see him for five hours and it was a couple days before we could hold him. I gave birth at midnight, so all of this was happening in the late late hours.
A couple of relatively common issues had happened, both of which on their own need immediate attention but are not difficult to deal with, but the resolution of one caused serious problems because of the second. His heart is fine. He's a perfectly happy healthy preschooler now who is squirting bath water into the tub faucet and laughing hysterically.