By this week of pregnancy your baby's crown-to-rump length reaches about 13.5 inches and the total length is approximately 20.7 inches. Your baby weighs about 6 pounds now. The top of your uterus has moved further up under your ribs and is about 5.5 inches above your bellybutton. Your uterus has grown a lot in the past few weeks as your baby has gained weight. You may have gained about 30 pounds by now and it is common for your weight to stay about the same from this point onwards. Because the top of the uterus is high as it will be, breathing may be getting very uncomfortable at times. You might notice jabbing pains from your baby's kicks. However, within the next few weeks, your baby will drop into the birth canal and this will make breathing easier again.