MEDIUM FLOW (3M+) Lets all types of medium-desnity liquids through. Ideal for milk, juice and purees. Made by the #1 Spanish baby bottle brand Suavinex. The Zero Zero Anti-Colic baby bottle is designed and made in Spain and endorsed by the SEOP (Spanish Society of Pediatric Dentistry). Designed to minimize baby bottle rejection and nipple confusion. Physiologically mimics the mammary glands during nursing, created to make baby bottle feeding feel as close to breastfeeding as possible. Helps reduce colic & prevents baby from swallowing air. Helps prevent reflux & ear infections. Range suitable for low birth weight & premature babies with weak sucking strength. Based on 2023 independent study by AIJU. Patented medical grade anti-colic bag within baby bottle contracts as baby sucks, preventing baby from swallowing air. Variety of nipples available according to the baby's age and desired flow.