Pigeon Nurture & Nest PPSU baby bottle set includes two 5oz (160mL) bottles designed to mimic natural breastfeeding. These Stage 1 bottles are ideal for newborns (0M+) and feature the Latch-On Line to guide appropriate positioning. Made from high-quality Polyphenylsulfone (PPSU), these bottles are lightweight, durable, and highly heat-resistant up to 356°F, making them suitable for various sterilization methods. The anti-colic system and soft silicone nipple support the three steps of baby's natural sucking motion: latching on, peristaltic tongue movement, and swallowing. BPA-free and designed for comfort and safety.