The phrase "growing uterus" refers to the gradual increase in size of a woman's uterus during pregnancy as the baby develops inside it. Full definition
As your baby grows your uterus stretches to accommodate it, putting increased forward pressure on your stomach muscles. (mombible.com)
First, your amped - up blood flow and growing uterus cause a lot of pressure inside your abdomen, prompting veins in your rectum to swell. (verywellfamily.com)
Moms see very dramatic hormonal changes during pregnancy, primarily in estrogen, a female sex hormone that helps grow the uterus and powers maternal behaviors, and progesterone, which helps grow the breasts and softens ligaments, including those of the cervix. (businessinsider.com)