The sucker, I ordered here, somehow have another anti-colic valve than the 2-hole sucker that I already had. Slots look different. My baby needs with the new suckers to settle air let into the bottle while it constantly purely draws air into the bottle in the old suckers. Sometimes it pulls the teat properly inward because no air comes through the valve into the bottle. But in and of itself does not harm the water break and yes I am satisfied with the Avent bottles broadly.