FOUND IN many reusable “sport” water bottles, metal-lined containers (such as those used for some baby formulas and cocoa powder), 1.9-litre/ five-gallon water bottles, and most plastic baby bottles.

WHAT IT CONTAINS polycarbonate, which may contain bisphenol A.

CONCERNS Bisphenol A is a suspected hormone disrupter and has been found to stimulate prostate cancer cells. Health Canada is proposing a ban on baby bottles containing BPA.

NEXT STEPS Replace plastic baby bottles with glass, and water bottles with stainless steel or those made of high-density polyethylene— labelled #2 in the recycling symbol. (Plastics labelled #1, #2, #4 and #5 are safer than those labelled #3, #6 and #7.) Avoid putting plastics into the microwave or dishwasher.