Development of Your BabyDuring this third trimester the baby will be able to see and hear. He or she may even react to light, temperature changes or loud noises. The brain continues its development and the kidneys and lungs continue maturing. The baby’s skull remains soft in order to more easily pass through the birth canal and the baby may begin to lower itself into position. The baby will be working on his or her reflexes, sucking on its thumb, swallowing amniotic fluid and even crying.
In the final weeks of pregnancy, the soft hair called lanugo has disappeared almost completely and the baby will be covered in the vernix caseosa. By the last couple weeks the baby should be in a head down position and lowering towards the birth canal.