From a practical perspective, going for optimal cord clamping, waiting at least 90 seconds, or until the cord stops pulsing or the pulses slow down is really simple. It doesn't cost anything. It just takes savoring that moment when the baby's firstborn a tiny bit longer. You can still do it if you want to bag cord blood. There's still enough left in there. You can still do it if the baby's born early. In fact it may be more important for premies. You can still do it in a C-section. But it's practically very, very simple. And something you should know - it's not just all of human history where it's been done this way, but it's all primates wait until the cord has stopped pulsing before they'll sever it. In fact, all mammals have umbilical cord. And not a single mammal will actively sever the cord before it stops pulsing.