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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.
It usually grows the most during puberty, which can start any time between 10 and 15. But it will continue to grâ¦ow into your adulthood. Where and when you develop is going to vary with the person. By 16 you probably have about as much as you are going to have.