Baby growth is consistent over the 40 weeks of pregnancy, but you may not notice any pelvic discomfort or pressure until well into the third trimester. Pressure often comes from your baby turning and moving in the uterus and as the 40th week approaches, from his or her head moving to the entrance of the birth canal.
Your baby is the main cause for pelvic discomfort and pressure. The average baby will weigh between six and seven pounds, which means six to seven pounds of pressure on the cervical opening. As your baby stretches and moves in the uterus, pressure can often feel strong and cause short bouts of pain.
Pressure can also be felt moving up toward the lungs and stomach. Until your baby “drops" (descends into the pelvic area), kicks and stretches may feel like your baby is trying to climb right out of the uterus. After the “drop” this pressure is often replaced with cervical pressure.
Discomfort and pressure on the cervical opening can also be a sign of impending labor. If pressure is accompanied by pain, cramping or spotting, the beginning stages of labor may be underway.
Your baby is going to put pressure on every internal organ and orifice, so dealing with this pressure is something you will need to master. Toward the end of the pregnancy, when discomfort and pressure are at their all time worst, you should spend plenty of time lying down on your side or sitting with your feet propped up. Warm baths, massages, and a belly sling to relieve pressure on the lower back can all help ease your suffering just a bit.