http://familydoctor.org/familydoctor/en/pregnancy-newborns/your-body/changes-in-your-body-during-pregnancy-third-trimester.html
Sounds like your baby is laying on a nerve, doesn't sound like anything to worry about:)
I found this on familydoctor.org
Tingling and numbness. The swelling in your body may press on nerves, resulting in tingling and numbness in the legs, arms and hands. The skin on your belly may feel numb, too, because it is so stretched out.
Tingling and numbness in the hands usually occurs because of carpal tunnel syndrome, which is caused by pressure on a nerve within the wrist. An easy way to relieve some of these symptoms is to wear a “wrist splints” at night when you are sleeping. Fortunately, the problem usually ends after pregnancy.