>The water isn't safe to drink, and Coke can be cheaper than milk or formula, so many moms feed their babies Coke instead [1].

I find your reasons hard to believe and your reference #1 proves nothing. If water is not contaminated chemically, boiling is the solution like millions of people do daily. I also find it hard to believe milk is more expensive than coke as UHT milk is easy to import in large quantities and cheap.(A fast check shows milk is half the price in Mexico, water is even cheaper). Perhaps people do it anyway, but reasons sound dubious to me.