Because Nutrients Matter 2 Extra Soft Silicone Nipples BPA Free Easy Latch Advanced Venting System Designed to Reduce Colic Suggested Use Suitable for use with Nanobebe bottles only.
Assembly:
Assemble the nipple and screw ring: insert the nipple into the screw ring and carefully pull the nipple in different directions to ensure the nipple is inserted evenly. Screw the bottle body onto the detachable base unit the ridge on the base is aligned with the ridge on the bottle body. Screw the nipple and screw ring assembly onto the bottle body and base assembly and ensure the two are evenly aligned.