Universe is a constant repetition of womb-like creations.
To start off, the womb itself allows a growth of a baby - a sustenance of life. It protects the vulnerable embryo.
    Human body, when grown, does not differ that much from ******. The skin separates the inner organism and life that wouldn't survive without an isolation from the environment.
    Earth is a womb as well. A speck flying in cold, lifeless space, with a barrier in form of atmosphere - humid, full of water and warmth, allowing life to grow.
   Cells are wombs, with their cell walls or membranes and life that happens within them.
   Maybe the Universe itself sticks to that scheme as well, being one of many life containing bubbles floating in some unknown dead void?