By using the Difrax 1-2-3 Variflow Teat Wide (best in combination with the 1-2-3 Variflow Ring Wide), you can dose the amount of nutrition and therewith determine the drinking speed of your baby while feeding. The outflow velocity can be adapted to the suction strength of your baby even while you are bottle feeding. These bottle teats (2-pack) are available for the S-baby bottle Wide 310 ml.