TKU.

With the Philips AVENT Classic Teat, baby controls the flow of milk, helping to reduce overeating and spit-up.
The unique valve opens to allow air to enter the bottle, promoting healthy, active feeding while reducing straining and colic.
More comfortable feeding at the baby’s chosen pace.
Easy to install due to the unique valve on the thread.
Clinically proven to reduce fogging, air gets into the bottle, not baby’s tummy.
Unique anti-colic system. BPA free and classic feeding bottle compatible