Maker lists it for Butterfly 2 and Butterfly 2 Plus.
About this pair
The Cybex Aton 2 goes on the Bugaboo Butterfly 2 with the Bugaboo Butterfly 2 car seat adapter (model 400018003), about $69.95. The seat itself is rated up to 35 lb and up to 30 in, per Cybex.
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18 other infant seats fit the Bugaboo Butterfly 2.
Summary from the makers' published data.
How to set up the Cybex Aton 2 on the Bugaboo Butterfly 2
What you need
The Bugaboo Butterfly 2
The Cybex Aton 2 carrier (its car base stays in the car)
The Bugaboo Butterfly 2 car seat adapter (model 400018003)
The adapter maker shows the fitting steps in pictures; see the manuals below.
Before every walk
Check that the carrier is locked on both sides the way your manual describes. How we check our answers
Last check: give the carrier handle a gentle tug. A seat that is fully latched does not lift off.