A gravid uterus is a uterus during pregnancy. Generally, a woman with a gravid uterus has an unborn fetus developing inside her uterus, and her body goes through many changes as she carries her unborn child in her womb. Changes that typically occur inside a gravid uterus include conception and growth of a fetus. A fetus usually receives nutritional support from its mother as it grows inside the pregnant uterus.

The average human pregnancy lasts for 40 weeks. After four weeks of pregnancy, a baby’s brain, spinal cord and heart typically begin to form and its legs and arms usually start to grow. All of a child’s major organs, including the sex organs, have begun to grow after eight weeks of pregnancy in most cases. Nerves and muscles of a fetus usually start to work together after 12 weeks of pregnancy.

An unborn baby’s skin typically begins to form after 16 weeks of fetal development. A woman may notice fluttering inside her gravid uterus at 20 weeks of pregnancy as a baby becomes more active. The bone marrow of a developing infant usually begins to develop blood cells after 24 weeks of fetal development. At 32 weeks of pregnancy, most expectant mothers notice that a child’s jabbing and kicking become stronger inside the gravid uterus. Most babies are at a full term of development after 37 weeks of pregnancy.

Expectant mothers usually experience many physical effects as a baby grows inside a gravid uterus. Pain in the abdomen, back and groin typically occur throughout a woman’s pregnancy as her gravid uterus grows larger. Resting, lying down and applying heat to sore areas may provide some relief from this pain. In addition to uterus growth, most women experience increased breast growth as the body prepares for breastfeeding. Constipation, dizziness and fatigue may also occur during pregnancy.

Other changes are often noticeable inside a woman’s body as she goes through pregnancy, including indigestion or heartburn as the growing uterus presses against the stomach. Hemorrhoids, abdominal itching and leg cramps are also possible during pregnancy. Morning sickness can occur during the first trimester of pregnancy and may cause vomiting and nausea. Increased urinary frequency and urinary incontinence may develop as a baby grows and causes the uterus to press against the mother’s urinary tract. Periodic doctor's visits during pregnancy provide most pregnant women with an opportunity to discuss body changes and effective means of treatment with a physician.