Lotus birth is the widely accepted woo practice, where the umbilical cord is left attached to the baby after birth. It is done for the various auric related benefits. The cord separates from the baby after 2-3 days, naturally. In the real world, lotus birth is the highly dubious practice, often for the various woo-related "benefits". This practice is condemned by the medical community for the various, very real, dangers this has for the infant.
 Supposed benefits
Historically, the practice was used to prevent open-wound infections, in early North American Pioneers, who were lacking in medical facilities and or access to medical practices. Modern-day proponents want to allow the "auric energy" in the placenta to flow to the infant. Another well-accepted reason in the crackpot community is the "naturalness" of the practice, out of a knee-jerk reaction to anything "unnatural". Furthermore, it reduces separation anxiety on the part of the child.
 Tangible dangers
As any doctor (aside from those who got their credentials from the university of natural medicine, et al) can tell you, leaving a dead, necrotic piece of flesh on your body is bound to end poorly. Interestingly, a common practice by "lotus birthers" is to marinate the placenta in sea salt, to prevent it from becoming malodorous. Now, what makes flesh malodorous? It can't be that it is rotting! In fact, most proponents are aware it is rotting, and in order to prevent it from becoming a hazard, treat it as a cured meat, only attached to their baby. Now how's that for natural medicine?