Why does giving birth usually take time for the contractions to proceed to the point when the child is born?

Sara is giving birth to her first child. She is concerned that her labor is taking longer than she thought it would. Why does giving birth usually take time for the contractions to proceed to the point when the child is born? explain to Sara in details the child birth process using what you learned about homeostasis, identify the feedback system and all the components of this particular feedback.

Use the Terminology that you learned in chapter 1 whenever applicable to answer the discussion.