so uh... what's wrong with canned baby formula??

The Environmental Working Group's blog recently had an excellent post on how toxins leach into some canned foods. Canned baby formula, chicken soup, and ravioli were the worst. Canned vegetables didn't score well either.
Foods that had some (but not a lot) of the toxin, in some of the brands tested: canned beans, tuna, fruit, and soda. Canned milk products were the least worrisome.
The toxin is BPA, which has been linked to neurobehavioral problems in the prenatally-exposed and to breast and prostate cancer. It leaches from the plastic resin lining inside the cans (Eden Organic Beans is the only company known to not use the resin in their cans-- except for their tomatoes).
BPA also leaches from some plastic baby bottles and water bottles, especially polycarbonate ones that might be marked with recycling number 7 (Nalgene is a common example). Non-leaching stainless steel water bottles are a better alternative as are glass baby bottles or other BPA-free baby products. Here's a quick guide on avoiding other plastic exposures.
But higher heat means more leaching, and canned foods are exposed to a lot more hot, leaching BPA during the canning process than most plastic water bottles ever could expect. This is also why you should avoid heating your food in plastic tupperware-- use ceramic or glass instead. And powdered baby formula and fresh or frozen vegetables, soups and pastas are better alternatives to canned.