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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.
Third Trimester Infant Development. Weeks 33 to 36. During this time your baby continues his rapid weight gain, gaining about half a pound per week (mom will usually gain about a pound a week). By week 36, the average baby will weigh almost six pounds and measure close to 19 inches in length.