At 38th week, your baby weighs about seven pounds and almost 21 inches long. At 38 weeks pregnant, your baby swallows that amniotic fluid and some of it winds up in his or her intestines where it — along with other shed cells, bile and other waste products (triple yum) — will turn into your baby's first bowel movement. His lungs continue to mature and produce more and more surfactant, a substance that prevents the air sacs in his lungs from sticking to one another once he starts to breathe. Most other changes this week are small but important.
Diet and exercise go hand in hand so keep in mind not to even miss one day of some sort of exercise in order for your pregnancy to be fruitful.