That does make sense but assumes that the connections between the placenta and the uterus are directly physiologically linked to blood flow (which of course is probably the case) by which I mean there could be another mechanism that causes detachment and the shutting off of the blood, naturally detachment must cause the cord to stop pulsing as there will be no pulse anymore, it being a maternal pulse. But it would be so interesting if, for example, bf triggered hormonal release in the baby that fed back to the placenta triggering hormonal release there which caused the blood flow to cease and tha in turn caused detachment of the placenta. It's fascinating to think of how these different processes might be connected and the influences they might exert. It could be the placenta stuff is entirely materially driven; could be mother hormones from bf that stimulate it. Could be that waiting a little to bf could actually prolong the time tip detachment, in a good way, allowing more blood to flow to the baby. I wonder if it's even at all understood?!