I had it totally backwards- I thought that was AFTER cutting the cord.
One of my uncles almost died when he was born- he almost bled to death- either they didn’t clamp him right away, or the clamp came off, I don’t remember. Physically, he could do just about anything, but he suffered some brain damage from blood loss. RIP Uncle Sam.
Assistance became interference. Cords can actually break on their own with mild tension. For Mother Nature, that’s how it works.
Babies were being born before doctors and nurses were around to clamp anything. Yes, if something is squirting red, clamp now. But foals, calves, lambs, babies all have umbilical cords. That’s why we are all mammals.