Philips Avent Natural bottle is compatible with the overall range ofPhilips Avent, excluding Classic bottles and cup handles. Natural bottles are advised to be used with the Natural feeding nipples ; Give your babies a more comfortable feed with the huge range of Avent Natural range of feeding bottles with wide breast shaped nipple ; The petals inside the teat increase the softness and the flexibility of the teat to ensure that no teats are collapsed for growing babies ; The unique anti-colic valve technology vents away the air from baby’s tummy and reduces fuss and discomfort whilst feeding.