27 Weeks

Got a sudden pain in your rear? That's just baby, settling into place for his upcoming debut. His head might be pressing on your sciatic nerve, which can cause pain and numbness down the backs of your legs. Don't worry -- it'll ease up soon after labor. For now, your aching back deserves a pat. You've reached trimester three!

Baby's lungs are going through some major developments these days, which (combined with the opening of previously plugged nostrils) means he's now able to practice inhaling and exhaling. The lack of air in your womb means every "breath" is filled with amniotic fluid, but hey -- it's progress.

This week, your baby weighs almost 2 pounds (like a head of cauliflower) and is about 14 1/2 inches long with her legs extended. She's sleeping and waking at regular intervals, opening and closing her eyes, and perhaps even sucking her fingers. With more brain tissue developing, your baby's brain is very active now. While her lungs are still immature, they would be capable of functioning — with a lot of medical help — if she were to be born now. Chalk up any tiny rhythmic movements you may be feeling to a case of baby hiccups, which may be common from now on. Each episode usually lasts only a few moments, and they don't bother her, so just relax and enjoy the tickle.

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