"Shorter labors" means that the process of giving birth to a baby takes less time than usual.
Sentences with «shorter labors»
So a very long labor or a very short labor may actually increase breastfeeding difficulty. (verywellfamily.com)
Ultimately, you will develop confidence in your ability to meet the demands of labor and delivery and have the possibility of an improved, less stressful and possibly slightly shorter labor. (pregnancy-info.net)
Again, shorter labor possibly, but not easier. (romper.com)