Increased fiber intake-during the third trimester, the enlarging uterus places pressure on the intestines. this coupled with the effect of hormones on smooth muscle relaxation causes decreased intestinal motility (peristalsis). increasing fiber in the diet will help fecal matter pass more quickly through the intestinal tract, thus decreasing the amount of water that is absorbed. as a result, stool is softer and easier to pass. enemas could precipitate preterm labor and/or electrolyte loss and should be avoided. laxatives may cause preterm labor by stimulating peristalsis and may interfere with the absorption of nutrients. use for more than 1 week can also lead to laxative dependency. liquid in the diet helps provide a semisolid, soft consistency to the stool. eight to ten glasses of fluid per day are essential to maintain hydration and promote stool evacuation.