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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.
In your second and third trimester, the guidelines from the Queensland Government recommend as a general guide to weekly weight gain: 1  If your pre-pregnancy BMI was less than 18.5, you should gain 500gm each week. 2  If your pre-pregnancy BMI was between 18.5 and 24.9, you should gain 400gm a week.