The following nipples are available as replacements to the Level-One nipples that come on every Dr. Brown's Natural Flow baby bottle. These nipples are for use with the WIDE NECK Dr. Brown's Bottles.
* Level-One - for feeding newborns 0+ months
* Level-Two - for feeding babies 3+ months
* Level-Three - for feeding babies 6+ months
* Level-Four - for feeding babies 9+ months
* Y-Cut/Cereal - faster flow for thicker liquids, 9+ months
Two nipples per package.