For the Zero.Zero bottle SLOW FLOW TEAT Lets a limited flow of liquid through. Indicated for the first few days for milk, glucose or water feeds. MEDIUM FLOW TEAT Lets all types of medium-density liquids flow. Ideal for milk, juice and very thin purées. DENSE FLOW TEAT Its wide opening gives off thicks liquids. ADAPTABLE FLOW TEAT The flow is proportional to the suction: allows more or less liquid to flow depending on the strength with which the baby sucks.