Suffolk County Executive Steve Levy said Thursday that he has signed the county's ban on polycarbonate baby bottles. "We owe it to our youngsters to minimize their exposure to potentially harmful products, especially when there are safe, toxin-free alternatives readily available," Levy said in a statement. Levy's signature codifies the county's ban on bisphenol A, widely known as BPA, from baby bottles and sippy cups sold in the county that are intended for children 3 years old or younger. The measure, which carries a $500 fine, will become law 90 days after it is officially filed with the secretary of state's office. Suffolk's health commissioner, Humayun Chaudhry, said last month that it would be "a challenge" to enforce the bill because county inspectors do not regularly monitor stores where baby bottles typically are sold. Chaudhry said the county would rely on consumer complaints to enforce the measure. Sen. Charles Schumer (D-N.Y.) earlier this week announced that he will introduce a measure in Congress to ban BPA from baby products nationwide.