plastic bottle

The bottles are described simply as plastic, and the nipples are commonly listed as silicone.

Many listings explicitly state BPA-free construction. Some also note they are phthalate-free and PVC-free or otherwise free of specific plastics.

Baby bottles list multiple nipple flow levels, typically including Preemie/Level 0, Level 1 (slow flow), Level 2 and Level 3 (faster flows). One listing also notes response-style nipples available in flow rates 1–5.

Several bottles include internal vent systems or integrated vents designed to route air away from the milk to help reduce colic, gas, and fussiness.

Suggested ages vary by type: baby bottles commonly list newborn and early-month ranges (examples include 0–3 months and up to 0–36 months), while sippy and other drink bottles are often labeled for older children (for example, 6 months and up or 3 years and up, depending on style).