IV Fluids - Why use IV fluids duing labor, and which ones do you use?

This was a question that I googled. This book seemed helpful. Basically I understood that you might use IVF during labor if there seems to be fetal distress or a significant change in the FHR. The book states that and IV bolus given to the laboring mother, can help expand blood volume and get more oxygen to the baby. It recommended 500-1000ml RL over 20 minutes. States 1,000 ml was better. It also cautioned Not to give glucose, like D5 or D5RL as this can cause more harm than good.

Here is the link where you can read some of the book Perinatal Nursing Book Preview