My estimated baby's weight is over 9 lbs, how can i help ease my back pain?

Not much you can do: I assume you are close to delivering. Honestly there is not much you can do at this point. You can try a warm bath or heating pad. You can try lying on your back with a pillow under your knees.

Tens unit, ice or ne: Your baby is fully formed so there are techniques that can help your pain that usually come from the ligaments getting lax for the delivery of your baby. Tens unit , ice, or local anesthetic injection may help.Cryo lysis of the nerves at the sacroiliac joint can stop your pain. Have the baby and your pain will get better. Good luck.