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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.
Most babies grow very rapidly after regaining their birth weight, especially during growth spurts, which occur around seven to ten days and again between three and six weeks. The average newborn gains weight at a rate of 2â3 of an ounce (20â30 grams) per day and by one month weighs about ten pounds (4.5 kg). She grows between 1 1â2 and 2 inches (4.5 to 5 cm) during this month. Boys tend to weigh slightly more than girls (by less than 1 pound, or approximately 350 grams).