"Dear Dr. Sears,
Three of our six babies (all breastfed) were very sensitive to dairy products in my diet during their early months. They all began to act very uncomfortable at 2-3 weeks of age, requiring in-arms attention 24/7, sleeping only when held, and varying amounts of facial eczema. There was in each case dramatic improvement within 3 days of eliminating all dairy products from my diet and a content, calm, alert baby with little to no spitting up by 2 weeks without dairy. Reintroduction of dairy always resulted in returning symptoms, although sometimes with less severity, until somewhere between 6 months and 12 months of age. My pediatrician insists that this dairy sensitivity is a physiological impossibility since the milk proteins are broken down by my digestive system into much smaller amino acids before entering my bloodstream and the breast is manufacturing the milk from these and other "bits and pieces" obtained from my bloodstream. I am very convinced by my experience, but I sure would like a scientific explanation for this phenomenon."