I'm not a doctor and my knowledge of childbirth is VERY limited. Also, this isn't a justification for not cutting the umbilical cord.

I don't think 30 minutes is going to make a big difference, considering the baby has been geststing for 9 months

But this logic seems a little dicey. I have been eating, breathing and having blood pump through me for over 3 decades if cease any of those activities even for a short period of time I could have issues. Sure you might be ok without the additional stem cells, but is it possible(don't mean this in a snarky way) that the baby doesn't immediately adjust to breathing on there own?

Again, I have no idea what I am talking about...