Can't say I'd want to carry a placenta around as well as a newborn baby for days. In my birth plan, I specified that I didn't want the baby's cord cut until it has stopped pumping blood, which only took a few minutes as it is. Besides, how do you put clothes on the baby when it's still attached to the placenta, which btw is quite large?
'Here, would you like to hold the new baby? Wait, here's the placenta as well!
Can you imagine the pong after 10 days?
No thanks. May work for some folks, but it's deffo not my cuppa tea.