This Medela bottle nipple has a wide base which better mimics the mother's nipple . This nipple is made of silicone, and has a slow flow suitable for babies newborn to about 4 months old. This pack includes 3 wide base nipples.
The Medela wide base nipple must be used with the Medela wide base collar to attach it to the bottle. Check out the Breastmilk Bottle Spare Parts Kit (below) for a complete set of compatible bottle parts.