Скачать или смотреть FOX 28 Investigates: Plastic Cup Dangers

COLUMBUS (Dawn Faugl) -- There are new concerns about the safety of the plastics your kids are using.

Many sippy cups and bottles are now marketed as BPA-free, but new research says many plastics release a chemical which acts like the hormone estrogen, even if they're BPA-free.

Pediatrician Diane Tenebaum told ABC 6/Fox 28 these estrogen-like chemicals can disrupt a child's natural hormonal development. "There's a lot of different theories about what this could be doing, from obesity issues to having puberty coming on a bit early," she said.

An alternative to plastic is using glass, stainless steel, or aluminim, but aluminum bottles often contain a BPA resin coating inside.