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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.
By the age of four to six months, the baby has usually doubled in weight. After that, expect your baby to gain up to 5 pounds per year until the age of five or so. Until the age of ten, growth steadily increases. Then the child hits puberty, and the biggest growth spurt of all seems to happen almost overnight!