BPA, BPS, BPF: same plastic risk explained

What BPA is and why it was a problem

Bisphenol A (BPA) is an industrial chemical used to make polycarbonate plastics and epoxy resins. It leaches out of plastic over time, especially with heat. BPA mimics estrogen in the body and even at low doses has been linked to thyroid effects, neurodevelopmental concerns, and reproductive issues. The strongest concerns came from prenatal and infant exposure.

The FDA banned BPA in baby bottles and sippy cups in 2012, then in infant formula packaging in 2013. Most other consumer plastic gear voluntarily moved away.

What BPS, BPF, and BPAF are

The replacements for BPA are chemically similar (the "bisphenol" structure stays, just with different atoms attached). The most common substitutes:

• BPS (Bisphenol S). The most common BPA replacement in receipts, bottles, and plastics.
• BPF (Bisphenol F). Used in epoxy resins, water bottles.
• BPAF (Bisphenol AF). Used in some specialty plastics.

Lab studies on these replacements show similar hormone-disrupting effects to BPA, sometimes equal in potency. The catch: long-term human studies are still accumulating. The regulatory response has lagged.

Where bisphenols show up in baby households

Food contact plastics

• Reusable sippy cups, training cups, snack cups, plastic plates.
• Plastic food containers, especially the kind you put in the microwave.
• Plastic baby spoons (less leaching than warm storage but still some).
• Plastic baby bottles. BPA-free is the law, but BPS and BPF replacements are common.

Canned food and drink linings

• Most canned vegetables, soups, and formula cans use bisphenol-based epoxy liners.
• "BPA-free can" labels usually mean a BPS or BPF liner.
• Acidic foods (tomatoes, citrus) and high-temperature processing (canning) cause more leaching.

Receipts and thermal paper

• Most receipts use BPS or BPA in the thermal coating.
• Handling receipts transfers measurable bisphenol to skin.
• Babies who chew on a wallet or grab a receipt get a higher dose for their size.

Plastic toys

• Polycarbonate toys (clear, hard plastic) often contain bisphenols.
• Toys with the recycle code "7" can be polycarbonate (but the code includes many other plastics too).
• Older or hand-me-down plastic toys are higher risk because pre-ban toys may still be in circulation.

Water bottles and reusable cups (adult)

• Polycarbonate water bottles still exist; check the recycle code or label.
• The classic "Nalgene" was reformulated. Most current ones are BPA-free, but the BPS/BPF question stands.

The high-yield swaps

For feeding

• Glass baby bottles. Heavier and breakable. Most leak-proof when paired with silicone sleeve. Pyrex is the workhorse.
• Silicone bottles. Comotomo, Olababy. Squeezable, light, dishwasher-safe.
• Stainless steel sippy cups. Klean Kanteen Sippy, Pura Kiki, Bumkins Stainless.
• Plates and bowls in bamboo, silicone, or stainless steel. EZPZ silicone, Avanchy bamboo with silicone suction base.

For storage and cooking

• Glass food storage with silicone or metal lids (skip BPA-free plastic lids).
• Never microwave any plastic. Use a glass or ceramic dish.
• Never put hot food in plastic. Wait until it cools or use glass.
• Skip plastic wrap touching hot food.

For drinking

• Filtered tap water (cheaper, often safer than bottled).
• Stainless steel or glass water bottles for older toddlers.
• Skip single-use plastic water bottles for daily use.

For canned food

• Look for "BPA-free AND can lining is rPET or oleoresin" (rare but exists).
• Prefer fresh, frozen, or glass-jarred when available.
• Limit canned tomato products (highest bisphenol leaching).
• Don't store opened can contents in the can in the fridge. Move to glass.

What the "recycle code" actually tells you

The number inside the triangle on the bottom of plastic items is a recycling code, but it also rough-categorizes the plastic:

• 1 (PETE): Polyethylene terephthalate. Common in disposable bottles. Not bisphenol-based but leaches antimony with heat. Single use.
• 2 (HDPE): High-density polyethylene. Used in milk jugs. Generally safer.
• 3 (PVC): Polyvinyl chloride. Contains phthalates. Avoid.
• 4 (LDPE): Low-density polyethylene. Generally safer.
• 5 (PP): Polypropylene. Generally safer.
• 6 (PS): Polystyrene (styrofoam). Avoid.
• 7 (Other): Includes polycarbonate (bisphenol risk) but also includes some safer plastics. Avoid for food contact unless labeled otherwise.

Aim for 2, 4, and 5 if you must use plastic for food contact, ideally cool and short term.

The honest summary

You will not eliminate bisphenol exposure. The goal is to reduce it during the highest-risk windows (pregnancy, infancy, early childhood) and especially during food contact and heat. The "BPA-free" label is reassurance you cannot fully trust. Glass, silicone, stainless, and "do not heat in plastic" are the rules that actually work.

Don't trash all your plastic and rebuy. Swap as items wear out. Prioritize anything that touches hot food, anything used daily for feeding, and anything used during pregnancy.