A recent study by the Centers for Disease Control and Prevention (CDC) has shown that many major-brand baby bottles leach bisphenol A, a chemical used in polycarbonate plastic and other shatterproof plastic food containers. Animal testing has shown that BPA has hormone-like effects on the reproductive system but more study is needed to see if it could be harming people.

American babies are widely exposed to BPA, but scientists have mixed opinions on its safety concerns. Though the Food and Drug Administration (FDA) says current uses with food are safe, some pediatricians advise families to use alternatives to polycarbonate bottles to be on the safe side.

Concerned over the chemicals found in the plastic bottles, many parents are switching over to glass bottles. Manufacturers like Dr. Brown's, Babies "R" Us, Evenflo have introduced glass bottle and its sales have picked up in the spring of 2007.

Many companies like Bornfree have also introduced BPA-free bottles and cups. However, many experts say there are certain drawbacks of glass bottles. Firstly they cost more than plastic bottles. A three-pack of 8 oz. Dr. Brown's polycarbonate bottles has a suggested price of $12.99, the same price recommended for a two-pack of the company's glass bottles.

Since glass bottles can break easily, parents need to be careful. Experts also add that once the babies can hold their own bottles and have started walking, they should not be given a glass bottle to drink on their own. They should then be introduced to sippy cup. There are several options of BPA-free plastic cups in the market today.

To minimize the risks of breaking, two California companies introduced a glass bottle that is sheathed in a protective silicone sleeve. The sleeve helps protect the bottle from breakage and bumping. The silicone is also a good insulator and provides a great tactile surface for babies' hands.