I didn't know that about cow's milk. I was given cow's milk from about 3 months on and my mother had to go to 2% because I couldn't tolerate whole milk. I wonder if cow's milk had anything to do with my messed up gut. I suppose it's better than the gruel they used to give babies in Europe prior to the modern era (I'm not sure when things shifted but I'd bet the Victorians did the switch).