Giving birth could be a deadly process.
This WHO article says how post-partum care is very important and neglected (true!)
This is a reflex that is rarely seen in the hospital because babies are separated from mother as soon as they are delivered. Read Taru Jindal's blog on lactational issues arising from not allowing breast crawl. Go through breastcrawl.org which is a website dedicated for this.
More on breastfeeding at World Alliance for Breastfeeding Action