My DS was born 2 weeks late by emergency CS and my waters were very heavily mec stained - it looked like brown runny poo (sorry for TMI!!). He was fine but did have to go to the special care nursery overnight the first night as he was gagging and choking on all the muck in his lungs. With a vaginal delivery this usually gets "squeezed" out so is not a big prob. My DD was born 1 week late by VBAC (yay for me!) and while my water was again mec stained she was fine.