Why do I need an IV during labor?
For the most part, an IV is put in place so that there is a way to immediately plug any medicines into your blood stream if it becomes necessary. Your OB might also use a drip of IV fluids to keep you hydrated during labor. (Just in case any medicines are ordered without your knowledge, always ask what is being sent through your IV line, or have your labor coach read the bag.)
Plus, more from The Bump:
How Will They Monitor Baby During Labor?
Delivery Room Tools Decoded
How Does an Epidural Work?