No proof, but there is evidence that polycarbonate baby bottles which contain bisphenol A (BPA) have a "hormone-like" effect on the reproductive system. The CDC has issued cautions and now the Canadian government will be banning this toxic substance.
There are a large number of substitutes and major manufacturers and retailers are acting quickly to remove BPA from their shelves.
No proof, but evidence of harm should be sufficient. When our children are exposed to substances which may be toxic or have significant long term side effects we have to act as quickly as possible to eliminate those toxins from our children's lives. Doctors and government agencies which insist that we have to prove harm are being irresponsible: It's the manufacturers' obligation to prove safety.
(I have not asked David Kirby's permission to use his book title in this post.)
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The use of soy in baby formula has been banned in New Zealand, but this is the only country that has had the spine to take on the powerful agricultural lobbies.
It has been proven to lower the sperm counts in men, and the estrogen levels in infants are alarming. If doctors legitimately recommend the use of soy for post menopausal women, why use this exact same ingredient for infants in baby formula?
Please read the studies and I hope this gets taken up as a cause by more people than the few scientists that have been pushed into the margins because they are taking on such powerful interests.