This was SO helpful! I think the NRP manual is fantastic but this was the one thing they didn't really explain and it had me confused as well (4th semester nursing student), interested in NICU. I have really enjoyed reading this manual so far I feel like I've learned a ton, and while I know I won't be ready to assist in this capacity right away I think learning it is going to be a huge asset to my general neonatal knowledge. Thanks again for asking this!