It is a wonderful time for woman, that moment when she realizes a new life is within her, stirring, growing, forcing her to think about eventually removing her gold belly-button ring. For Madonna, that revelation came in Buenos Aires last March during the shoot for the musical Evita, when she learned that, after years of talking on the Late Show with David Letterman and in similar intimate venues about trying to get pregnant, she was finally tangoing for two. Delighted but already feeling protective of her unborn child, she at first spoke of the situation only to her sister, her personal trainer and, of course, to the baby’s father, Carlos Leon. But secrets about Madonna seldom stay kept. By the time she checked into Good Samaritan Hospital in Los Angeles last week, there were tofu merchants in Bali who knew she was leaning away from a C-section, and the paparazzi, like contractions, were arriving every few minutes. It was not an easy birth. Madonna’s labor began at 3:30 a.m. l