During the third trimester, your fetus continues to grow in size and weight. The lungs are still maturing, and the fetus begins to position itself head down. By the end of the third trimester, the fetus is about 19 to 21 inches long and weighs, on average, 6 to 9 pounds.

What should I avoid during third trimester?

Avoid long car trips and airplane flights, if possible. If you must travel, stretch your legs and walk around at least every hour or two. Your doctor will generally permit you to travel by air until 32 to 34 weeks, unless you're at high risk for premature labor.

What are 3rd third trimester symptoms?