In women's circles we talked about this. In the book (The Push by Ashley Audrain) which I'm reading currently, she opens with this:
"It is often said that the first sound we hear in the womb is our mother's heartbeat.. Actually the first sound to vibrate our newly developed hearing apparatus is the pulse of our mother's blood through her veins and arteries. We vibrate to that primordial rhythm even before we have ears to hear. Before we were conceived, we existed in part in our mother's ovary. All the eggs a woman will ever carry form in her ovaries while she is a four-month-old-foetus in the womb of her mother. This means our cellular life as an egg begins in the womb of our grandmother. Each of us spent five months in our grandmother's womb and she in turn formed within the womb of her own grandmother. We vibrate to the rhythms of our mother's blood before she herself is born......
Layne Redmond: When the Drummers were Women.