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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.
Height is often hereditary, so if the parents are especially tall, the baby is more likely to grow taller than other babies of the same age. On average, a baby will grow one to two inches a month for the first three months of life, and another two inches between four and seven months old. There are also ways for you to help increase the rate of growth in your baby.