Here's a little excerpt from an article by Dr. Michel Odent, noted French obstetrician.

"According to traditional wisdom in rural France, a baby in the womb should be compared to fruit on the tree. Not all the fruit on the same tree is ripe at the same time. A fruit that has been picked before it is ripe will never be fit to eat and will quickly go bad. It is the same with a baby. In other words, we must accept that some babies need a much longer time than others before they are ready to be born. If you have some apple trees in your garden, you will listen to your common sense and choose an individualized and selective approach: you will not pick all the apples on the same day."