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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.
In a healthy infant, the most rapid growth occurs in the first six months after birth. Brain weight doubles by four to six months and triples by a baby's first birthday. By age two, the brain is about 80 percent of adult size, said Zecavati. If a child doesn't meet those benchmarks, microcephaly is a concern.