Anti-colic base vent design: Innovative patented base vent separates air from liquid, ensuring smooth milk flow without air intake, reducing colic, reflux, and gas. Switch Effortlessly, Latch Naturally: Breast-like shape and soft-textured base mimic mom s natural feel babies embrace the bottle without resistance, making mixed feeding calm and frustration-free. Innovative multi-hole nipple design: Only flowing milk when baby actively drinks,support baby's own drinking rhythm,like at the breast.Prevents milk from flowing too fast and causing choking. Sealed design, no milk leakage: No air valve at the bottle neck, preventing milk from leaking. 4 stage nipple flow: 4 flow options tailored to different age stages, preventing choking and supporting baby's development. Bpa and bps free.