Visually, your baby may track moving objects with the eyes. When he or she blinks, the eye's iris responds to light and dark. The lungs and digestive track are nearly mature, although the last few weeks in-utero are still important for lung development. Your baby is now around 14-1/2 inches head-to-toe, and weighs nearly three pounds, five ounces.

You may worry that if you are breathless from walking or sometimes even just sitting that your baby is in danger. This is not true. Your baby is getting plenty of oxygen from your placenta.

The baby's irises can now dilate and contract in response to light. Due to the deposits of white fat underneath the skin the baby's skin is no longer red but pink, and the finger nails may reach the end of the hands.

Your baby is busy accumulating layers of fat under his skin as you continue your pregnancy week by week. The arms, legs and body start to fill out and look less wrinkly as each week progresses. Your baby may be finding the space in your womb tighter and tighter by 31 weeks pregnant. You may also feel more and more uncomfortable by pregnancy at 31 weeks as your baby continues to grow and the space in your womb decreases each week.

Though your baby's movements should continue to be strong, they will likely be less dramatic and sporadic at this point in your pregnancy. You may see an arm slowly moving across your belly. You will probably start realizing just how strong your unborn baby is from here on out. Kicks and sudden movement changes may cause you to gasp unexpectedly, much to the delight and amazement of onlookers.