Let’s get right away to the nitty-gritty of motherhood. We’ll start with diapers. After being born, the average baby needs about 2,500 diaper changes in the first year of life. Over the next two years, he or she may go through another 3,600 diapers or so. Suppose you have three siblings. Unless you had a nanny, a boatload of babysitters, or a stay-at-home dad, that woman you call mom has changed well over 20,000 diapers in her lifetime. She also fed some 4,000 meals to babies and toddlers. She probably told each of you to say “please” or “thank you” 1,000 times. She dressed you every morning for several years and put you into jammies every night before you went to bed. She’s the woman who kissed your “boo-boos” when you fell and who later drove you day after day to dance class, football practice, and Scouts. Her wrinkled face …