Birth Detective: Why didn't my OP baby come down? Part 1 of 3

Posterior presentation alone will not predict the course of labor.  Posterior presenting babies can come within 3, 5, 24-hours, though some posterior labors take 36 hours or longer labors. 
Add tight or short muscles, or a small pelvic outlet, and delays and interventions increase.

Spinning Babies take on the 3 Ps (Power, Passage, and Passenger) was discussed in the previous blog post. 

Here's