Your baby is still packing on the pounds at the rate of about an ounce a day. He now weighs almost 6 pounds and is more than 18 1/2 inches long. He's shedding most of the downy covering of hair that covered his body as well as the vernix caseosa, the waxy substance that covered and protected his skin during his nine-month amniotic bath.
At the end of this week, your baby will be considered "early term." (Full-term is 39 to 40 weeks. Babies born before 37 weeks are pre-term, 41 weeks is late term, and those born after 42 are post-term.) Most likely your baby is already heading-down. But if not, your practitioner may suggest scheduling an external cephalic version (ECV). That's a fancy way of saying that your practitioner will apply pressure to your abdomen to try to manipulate your baby into a head-down position.
You might also notice that your Braxton Hicks contractions are more frequent now. Be sure to review the signs of labor with your practitioner and find out when she wants to hear from you. As a general rule, if you're full-term, your pregnancy is uncomplicated, and your water hasn't broken, she'll probably have you wait to come in until you've been having contractions that last for about a minute each, coming every five minutes for an hour. Of course, you'll want to call right away if you notice a decrease in your baby's activity or think you're leaking amniotic fluid, or if you have any vaginal bleeding, fever, a severe or persistent headache, constant abdominal pain, or vision changes.
Even if you're enjoying an uncomplicated pregnancy, it's best to avoid flying (or any travel far from home) during your final month because you can go into labor at any time. In fact, some airlines won't let women on board who are due to deliver within 30 days of the flight.