Chances are your diaphragm is feeling a little cramped these days. Okay, a lot cramped. That's because your uterus is pushing up against it, crowding your lungs and making it more difficult for them to expand fully. The result: Your body is spare on air, and will be until your baby drops near the end of pregnancy in preparation for birth. Your baby, however, is happy as a clam since he gets all the oxygen he needs through the placenta. Weighing in at three-plus pounds and measuring 18 inches long, he's quickly approaching his birth length though he's got to pack on another three to five pounds before D-day. Also developing at an impressive clip: your baby's brain connections (he's got to make trillions of them!). He's now processing information, tracking light, and perceiving signals from all five senses. He's also putting in longer stretches of sleep, which is why you're probably noticing more defined patterns of awake (and moving) periods and sleeping (pretty still) periods.
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