In the 30 weeks pregnancy period, while the toenails of the baby begin to grow, the brain and lungs continue to mature. Until now, the baby’s brain surface was completely smooth. But now the characteristic grooves and pits have begun to form. Now your baby’s body temperature is starting to regulate the brain and new fat cells. Before that, the soft hairs called Laguna that covered your baby’s body began to disappear. Your baby’s bone marrow has taken over the task of producing red blood cells.