Have you ever wondered how after the excruciating pain a woman may go through during child birth can she do it again, sometimes 3, 4 or even 5 or more times??? Well it's for multiple reasons but one is because even though we know there was pain we don't really remember it vividly and that's all by God's design. He is so amazing!
John 16:21 (KJV) A woman when she is in travail (labour) hath sorrow, because her hour is come: but as soon as she is delivered of (has given birth to) the child, she remembereth no more the anguish, for joy that a man (human being) is born into the world.
Just as our monthly cycle is by His design so is the miraculous act of child birth! :)