I would assume they relax and stretch along with the uterus, since the uterus is a muscle as well. In certain cases though you can have a diastasis recti which is when the most outer layer of muscle splits in the middle and this can cause what looks like a valley in the abs later on after baby is born.
The Eastern Time (ET) or Eastern Standard Time (EST) is also known as North American Eastern Standard Time. It is the time zone that pertains to the east coast of North America. The clock time in the Eastern Time is based on the mean solar time of the 75th meridian west of the Greenwich Observatory in London.
There is the Eastern time zone, the Central time zone, the Mountain time zone, and the Pacific time zone in the United States. Each of these time zones is split up geographically in order to better suit the areas that are receiving light at certain hours. The Eastern time zone is one hour ahead of the Central time zone. So if it is 8:00 p.m. in the Eastern time zone, it is 7:00 p.m. in the Central time zone. The Eastern time zone runs along the eastern seaboard of the United States including all the states that touch the Atlantic ocean.