What is the name muscular contractions before birth?

The muscular contractions that occur before birth are called Braxton Hicks contractions. These are also known as "false labor" contractions and help to prepare the uterus for the actual labor process. They are typically irregular and can vary in intensity, serving to tone the uterine muscles and promote blood flow to the placenta. Unlike true labor contractions, Braxton Hicks contractions do not lead to cervical dilation.