If you are uncertain of the types of plastic in your toddler's drinkware, check the bottom of the cup, which may state it as a number. 1, 2, 4, and 5 are OK, but 3 and 6 are not, and 7 usually is not, either. If the number is not specified, you can call the company or simply replace unaccounted-for plastics with known safe alternatives.

[ Z Recommends: Sippy Cup Showdown: Safer, BPA-Free Drinkware For Toddlers ]

Toddler's drinkware? How about everyone's everything? Babies and toddlers are known to lick things, and who can keep track of kids 24/7? I need to commit 3, 6, and 7 to memory and make sure I avoid these newly found to be poisonous (and hormonal) plastics. I see aluminium is an alternative, but I thought that could cause alzheimers...