BPA can get leeched out of the bottles and into the milk. This happens especially at higher temperatures or when the bottle or cup is getting older, says Anjali Rao, a pediatrician with Northwestern Memorial Physician's Group.
We love Sigg's water bottles for their fantastic kid-friendly designs added to their BPA-free, phthalate-free, VOC-free interior. And we adore the Klean Kanteen line of stainless steel baby bottles, sippy cups and water bottles. They're also free of BPA, lead, phthalates and toxins.