You're in the home stretch — two trimesters down, one more to go. Your baby is growing steadily as he prepares for delivery day. He will gain weight rapidly over the next weeks and, as the size of your bump increases, you may feel more breathless and tired. Your baby's acting more like a newborn now, too. He opens and closes his eyes, sleeps and wakes at regular intervals, and may suck a finger or thumb. He may also be hiccuping a lot this week, which explains that odd rhythmic sensation you've probably been feeling.