Are Plastic Baby Bottles Safe?

Plastic baby bottles are convenient, cheap and unbreakable. But are they safe?

Parents breathed a sigh of relief when the U.S. Food and Drug Administration banned the potentially harmful chemical bisphenol-A (BPA) from plastic baby bottles and sippy cups in 2012. Unfortunately, though, BPA may not be the only concerning ingredient in plastic babyware.

“Even a BPA-free plastic bottle has some risk,” says pediatrician W. Kyle Mudd, DO. “But you can take steps to limit risk as much as possible.”

The dangers of plastic bottles

The science of plastics and health is a little fuzzy. Many ingredients in plastic haven’t been thoroughly tested in people. Much of what we know comes from studies in animals.

“We don’t know exactly how all of these compounds affect human health,” Dr. Mudd says. But there are hints that compounds in plastics may be linked to problems.

BPA is one of several bisphenols, which are chemicals used to harden plastics. Since bisphenols can mimic the body’s reproductive hormones, they may affect fertility and the timing of puberty. There’s evidence they may also increase body fat and affect the nervous and immune systems.

Chemicals in plastics pose one problem. But bits of the plastic material may pose another risk. Many plastic bottles and sippy cups are made with the plastic polypropylene. And a 2020 study found that bottles made of polypropylene shed millions of microscopic plastic particles into the liquid they contain. When babies drink from those bottles, they ingest the so-called “microparticles,” too.

So far, scientists don’t know how — or even if — these microplastics might affect health. But until we have more research, use plastic bottles with caution, Dr. Mudd advises.

Reduce exposure to microplastics and chemicals in plastic

With some simple steps, you can significantly reduce the amount of chemicals and particles that end up in your baby’s drink.

Consider alternatives

Some parents choose to avoid plastic altogether, swapping for glass or stainless-steel bottles or sippy cups. These options are safer from a chemical standpoint, Dr. Mudd says.

But they do have some drawbacks. Glass is breakable, of course, which can be a concern with a baby’s little fingers (or, for that matter, an overtired parent’s clumsy fingers). Glass and metal products may also be more expensive, so they’re not an option for everyone.

Steer clear of high temps

Heat causes plastics to shed more chemicals and particles, so avoid high-temperature situations. Skip the dishwasher and clean bottles by hand in warm (not hot) soapy water. And don’t ever heat plastic bottles in the microwave.

Store milk smartly

To minimize exposure to plastic, don’t store formula or breast milk in plastic bottles. Keep it in a glass container in the refrigerator or freezer, and pour it into the bottle just before feeding time. (Discard any leftovers that your baby doesn’t finish during that meal.)

Don’t shake (what your mama gave ya)

Vigorously shaking a bottle can cause more microplastics to flake off into the liquid. If you need to shake up formula to mix it, do so in a glass or stainless-steel container before transferring it to the plastic bottle.

Plastic baby bottles: Balancing risk

While it’s helpful to be aware of the risks, don’t lose sleep over your baby’s plastic bottles. (Let’s face it, if you have a baby at home, you’re losing enough sleep as it is.)

Remember, too, that the baby stage will (sigh) be over before you know it. Whatever bottle you choose, it won’t be long before it’s a thing of the past. And if you’re worried about sippy cups, there are non-plastic options for those, too.

In the meantime, you can balance the risks of plastic with reasonable precautions. “Parents should be aware of the potential risks of plastic, but there’s no reason to be overly anxious,” Dr. Mudd adds. “There are always some risks in life. As parents, we just have to do our best to minimize them.”