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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.
Baby's Hair in the Womb. Babies start growing hair before they are even born, Kids Health says. By the 14th week of pregnancy, babies in the womb develop a layer of lanugo, which is a soft, fine hair that starts on his face and eventually covers his entire body. Hair starts to grow on a babyâs head as early as the 30th week of pregnancy and, by the 32nd week, the baby develops eyelashes and eyebrows.