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Week 38: Baby develops a firm grasp. Thirty-eight weeks into your pregnancy, or 36 weeks after conception, your baby is developing a firm grasp. Your baby's toenails have reached the tips of his or her toes. His or her brain might weigh about 14 ounces (400 grams). After birth, your baby's brain will continue to grow.
Now that you have reached the third trimester, you are literally in the final stretch. During the final months of pregnancy, your baby puts on the most body weight. In fact, according to the American Pregnancy Association, a fetus weighs just 4 pounds at 27 weeks, but will grow to 6 &frac34; pounds to 10 pounds by the time you go into labor. Your baby will also grow an average of four to six inches long during the third trimester.