The legislation would ban Bisphenol A - or BPA - in baby bottles and so-called "sippy cups" for children three years old or younger.
Supporters of the ban say there's evidence the chemical disrupts hormones, particularly in children. During the floor debate, Democratic Senator Lou Correa pointed out that other governments have taken similar actions:
"Europe has moved in this direction, other states have moved in this direction, and even China has moved in this direction. We cannot let California lag behind in this most important issue."