The philips avent classic anti colic feeding bottle includes everything you need to bottle feed your new bornthe pack includes 2 philips avent classic bottles with slow flow anti colic teats which allow air to travel thrgouh the neck of the bottle helping prevent colic and providing a slow gentle flow for your child the bottles are compatible with most of the philips avent range and comprise of only 4 easy to assemble parts which are all dishwasher and microwave safe