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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 24 months: Most babies have quadrupled their birth weight and will have grown 14 to 16 inches from their birth length. At each of your baby's well visits your pediatrician will track your child's weight, height, and head circumference on a growth chart.