The ease of the second trimester recedes as the baby gets bigger and bigger in the third trimester. The mother may experience increased discomfort as the fetus gains weight, stores fat, and gets into position for birth. Pregnancies are considered early term if the baby is born after 37 weeks and full-term at 39 weeks.


1. A Growing Baby

At week 28 of pregnancy, the fetus is roughly ten inches long and weighs between two and three pounds. It grows to birth size over the next 12 weeks or so. As the baby takes up more space in the uterus, the mother's breathing often becomes labored because the lungs have less room to expand. Urinary frequency increases due to excess pressure on the bladder. Heartburn, indigestion, and constipation can worsen.

Third Trimester Changes scaliger / Getty Images

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