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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.
Best Answer: 4-6 months is the general 'rule' ... but all babies are different, and a baby who is small at birth will 'double' sooner than a baby who is large at birth. The better rule is that baby 'should' gain at least a pound a month, with 2 pounds/month being the average.