Your baby continues to grow taller and fill out as you near the end of your pregnancy. By now, he weighs approximately 3 pounds (1400 g) and measures about 17 inches (38 cm) in total length. Your baby is continuing to grow rapidly now. In preparation for the journey to the new world, the baby is making movements that represent breathing even though the breathing inside remains the amniotic fluid. Sometimes at this point the baby may get hiccups and you may feel that happen!
Only 31 weeks, your baby weighs in at about 3 pounds 5 ounces (1590 g), and measures over 18 inches (46 cm) tall. Thanks to the deposits of white fat underneath the skin, the baby's color is changing from red to pink. At this point, the baby's irises dilate and contract in response to light, and his fingernails may extend to the end of the hands.
The organs are also in a growth period. Don't worry: Even if your lungs (and heart) make you feel breathless when you climb a flight of stairs or walk around the block, your womb mate is getting plenty of oxygen from your placenta.