Midwife Thinking's Blog has another fantastic post, this time about the amniotic sac:
In defence of the amniotic sac
She explains the form and function of the amniotic sac, or caul. It's very interesting and educational, and includes a photo and video of a baby being born in an intact sac. What I love is how an intact sac can help cushion a baby and also aid dilation through labor at the same time. For me it reinforces the belief that the bag of waters shouldn't be routinely broken. It also serves as a reminder that it's generally better to leave things alone and let nature take its course.
The photo to the right is from the blog post and shows a newborn who was born "in the caul". The sac comes off easily after birth.