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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.
How is your baby growing at 16 weeks? At about 12cm from head to bottom (crown to rump) and 100g, your baby may have grown by approximately a third since the previous week. Now having additional bone structure in the back and stronger muscles, the body is straighter and the head can be supported in an erect position.