When my daughter was 5 months old, she developed a rash on her face. I watched it for a couple of days and noticed it was worsening, so I took her to a family physician in Hadley, Massachusetts. “What do you think’s wrong?” Dr. Robert Weitzman asked. I cuddled the baby on my lap, a little taken aback by the question. “That’s what I came here to ask you,” I said. He was quiet for a moment. “I think you know,” Weitzman said. And he was right. I was pretty sure that the baby had an infection caused by an overgrowth of some type of Staphylococcal bacteria. In other words, a staph infection, I said. He nodded in agreement. “So, what do you think we should do?” he asked. That time I burst out laughing. “Aren’t you supposed to tell me?!” I asked. “I think you know,” Weitzman said again. …