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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.
During the fetal stage, which runs from the 11th week until birth, your baby will grow longer and gain weight fast, and organs and body parts will continue to develop. 1  The last 2 weeks of the first trimester are the beginning of the fetal stage. In those weeks, fingernails and toenails form and the kidneys start working. By the end of the 12th week, which is the end of the first trimester, your baby has tripled in length to about 3 inches long.