Borosilicate glass releases zero microplastics during sterilization — unlike plastic bottles, which shed up to 16 million particles per cycle.

Glass feeding bottle with a silicone nipple, so milk is heated and held in glass rather than plastic. The screw collar is plastic, which is true of every glass bottle on the market.
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Avoid heating milk in plastic bottles, and never microwave any bottle — it heats unevenly and scalds. The honest cost of glass is weight and breakage: a glass bottle dropped on tile breaks, and it is heavier for a baby learning to hold one. A silicone sleeve solves most of that.
Straight answer: we're a research team, not a testing lab. Here's exactly what our rating is based on — and what it isn't — so you can weigh it honestly.
Anything that adds a known microplastic, PFAS, or off-gassing source — a non-stick coating, a plastic surface against food or skin, vinyl/PVC — is downgraded or cut. We only list what clears that bar.
Borosilicate glass releases zero microplastics during sterilization — unlike plastic bottles, which shed up to 16 million particles per cycle.
Glass bottle inside a silicone sleeve — the sleeve is what makes glass practical with a baby, because it grips and it contains the glass if it is dropped.
Glass bottle with a silicone sleeve included and an angled nipple designed for latch — glass for the milk, silicone for the mouth and the grip.
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