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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.
Your infant will grow about 1 inch per month for the first 6 months of life. He will grow Â½ inch per month between 6 months and 1 year of age. He should be 2 times longer than his birth length by the time he is 10 to 12 months old. Most of his growth will happen in his trunk (mid-section).