35 weeks

Your baby doesn't have much room to maneuver now that he's over 18 inches long and tips the scales at 5 1/4 pounds (pick up a honeydew melon). Because it's so snug in your womb, he isn't likely to be doing somersaults anymore, but the number of times he kicks should remain about the same. His kidneys are fully developed now, and his liver can process some waste products. Most of his basic physical development is now complete — he'll spend the next few weeks putting on weight. His nervous system and immune system are still maturing, and he's adding the fat that he'll need to regulate his body temperature. But, everything else, from his toenails to the hair on his head, is fully formed. If he were born now, he'd have more than a ninety-nine percent chance of surviving.