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Weeks 26 to 32. During the first six weeks of the third trimester, your baby will more than double in sizeâgrowing from approximately 1.5 to 3.5 pounds. He will also grow in length from about 14 inches to almost 17 inches. The baby's growth during this period is an important indicator of his health.
Fetal development during the third trimester. During the third trimester, the 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. During the third trimester: 1  The fetus can see and hear. 2  The fetusâs brain continues to develop. 3  The kidneys and lungs continue to mature. 4  By the 36th week, the head may engage (drop into the pelvic area), which is a process called lightening.