Does pain-free childbirth carry the same reward as painful childbirth?

The question contained two issues: First, the ruling on using needles to alleviate pain during childbirth. It is permissible to use them as long as it does not result in a greater harm. Second, the reward for childbirth without pain, and whether it is equal in that regard to childbirth with pain? The reward is commensurate with the hardship.