When my oldest was born, we embarked on the journey of breastfeeding. She took to it naturally, but the first week was painful and discouraging for me as a new mom. However, in time we fell into a comfortable and relaxing routine. At about six weeks of age my daughter began crying a lot. She was fussy, gassy, and unhappy. While I was nursing one morning, she projectile vomited. I called the doctor...