Help! pain because baby weight presses stomach during feeding?

need help from experienced feeding moms! My baby is 2-3 weeks old and I have been feeding 8 times a day. Each nursing takes about 30-40 minutes. Hence the baby stays on my stomach more than 5 hours a day. I started having stomach pain a couple days ago because all the pressure from the baby's weight for such long hours. Is it because my feeding position is incorrect? I use a quilt around my waist and put the baby on the quilt, facing me. I'd be half lying on the couch or bed. Help!