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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.
If this incredible rate of growth were to continue, it would translate into a rate of more than 4 feet (1.2 meters) per year. Growth slows toward the end of pregnancy as the baby fills the uterus. At birth, full-term babies are usually 19 to 21 inches (48 to 53 cm) long and weigh from 6 to 81/2 pounds (2.7 to 3.8 kg).